Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b56acadb78a8355…

MALICIOUS

PDF

48.1 KB Created: 2020-10-17 23:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 910ee2286e6fc5e4afc6daed08158c1a SHA-1: 98236f9dffd9e76f317cc48c8a5c587318ce8863 SHA-256: 5b56acadb78a835529754be247e8d6dc2991bbff8d79e270a6304bce8af5ddea
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable hosting and redirect to malicious infrastructure. The primary malicious URL identified is https://ggtraff.ru/strik?keyword=%25D0%25BA%25D0%25BE%25D0%25BD%25D1%2581%25D0%25BF%25D0%25B5%25D0%25BA%25D1%2582+%25D1%2583%25D1%2580%25D0%25BE%25D0%25BA%25D0%25B0+%25D0%25BD%25D0%25B5%25D0%25BF%25D1%2580%25D0%25BE%25D0%25B8%25D0%25B7%25D0%25BD%25D0%25BE%25D1%2581%25D0%25B8%25D0%25BC%25D1%258B%25D0%25B5+%25D1%2581%25D0%25BE%25D0%25B3%25D0%25BB%25D0%25B0%25D1%2581. This indicates a link farm designed to redirect users to potentially harmful content. No scripts were extracted, and the document body was unreadable, but the heuristic firings strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ggtraff.ru/strik?keyword=%25D0%25BA%25D0%25BE%25D0%25BD%25D1%2581%25D0%25BF%25D0%25B5%25D0%25BA%25D1%2582+%25D1%2583%25D1%2580%25D0%25BE%25D0%25BA%25D0%25B0+%25D0%25BD%25D0%25B5%25D0%25BF%25D1%2580%25D0%25BE%25D0%25B8%25D0%25B7%25D0%25BD%25D0%25BE%25D1%2581%25D0%25B8%25D0%25BC%25D1%258B%25D0%25B5+%25D1%2581%25D0%25BE%25D0%25B3%25D0%25BB%25D0%25B0%25D1%2581 In PDF document text
    • https://fevixivosetakub.weebly.com/uploads/1/3/2/6/132681861/ffa66d1.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/7922058.pdfIn PDF document text
    • https://runebipunozup.weebly.com/uploads/1/3/1/4/131406604/lorukeje-famipumeremud-rubagipiv.pdfIn PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/ligoxeloterewubim.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/5058540.pdfIn PDF document text
    • https://varipejat.weebly.com/uploads/1/3/0/7/130739080/684245.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/5473886.pdfIn PDF document text
    • https://lebabipiw.weebly.com/uploads/1/3/0/9/130968925/kezexetapusa_taxapefawaxifof_tuvisab.pdfIn PDF document text
    • https://saxexowiki.weebly.com/uploads/1/3/0/9/130969873/lukusuv.pdfIn PDF document text
    • https://fupexorugukemig.weebly.com/uploads/1/3/0/8/130814763/9497983.pdfIn PDF document text
    • https://xumogimunosu.weebly.com/uploads/1/3/1/6/131607683/rademisewusabanasol.pdfIn PDF document text
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/vefena-joxegevow-saxosedopaxeta-farorewufama.pdfIn PDF document text
    • https://vuxilimibipemop.weebly.com/uploads/1/3/1/4/131453056/4fe5684cf11.pdfIn PDF document text
    • https://kekerisasil.weebly.com/uploads/1/3/0/7/130775365/kowemelujolataj_wadenolipomixa.pdfIn PDF document text
    • https://sepikupi.weebly.com/uploads/1/3/0/7/130738949/miwuvozililer.pdfIn PDF document text
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/622ff218d14.pdfIn PDF document text
    • https://molisemopum.weebly.com/uploads/1/3/1/4/131437834/jefujowidegupe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6799/8359/files/40287835264.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7862/3138/files/pizesanaviwabow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/2627/5240/files/tico_study_manual_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2172/8919/files/93809845230.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5986/6521/files/the_old_hound_poem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/250bda10-fad0-4cdd-b7e5-b5c850960360/wabijuzimuxudelamulubon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f003366e-bae0-480b-a8ca-256b8ae41424/ponunirotatojopale.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE6 5760 bytes
SHA-256: 9554662202cc8a71fee46fa1e4bad39fd1bb160c428d23db39b4ba079edfe4ae
font_01_sfnt_off0000810b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x810B 14828 bytes
SHA-256: c4d476951337d7046cffbf48191092ff68cc2388ab3076208a046ca35608f740

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