Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbc7b694126dc275…

MALICIOUS

PDF

39.5 KB Created: 2020-10-05 21:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 208ad4ddba7811d694e123da8de80557 SHA-1: a6b6d695601de4850026ffae2a2147ed6d8b74e3 SHA-256: dbc7b694126dc275b2982ae70e00895557ad5bf0da54c510061cda02f8418bc5
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on disposable domains. The initial URL is identified as a malicious redirector, suggesting a phishing or malware distribution scheme. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=badlands+superday+pack+bino+connect In PDF document text
    • http://files.ecovalleyconstruction.com/uploads/1/3/1/4/131407572/6219474.pdfIn PDF document text
    • http://files.3islandsdesigns.com/uploads/1/3/1/0/131070567/tigeva_javejitekuba_letufep.pdfIn PDF document text
    • http://milapugew.blakkanvas.studio/uploads/1/3/1/3/131379117/6612195.pdfIn PDF document text
    • http://files.mybfcog.com/uploads/1/3/0/7/130739530/subozodulegisunepero.pdfIn PDF document text
    • http://ketator.heritagefloristcortland.com/uploads/1/3/1/4/131453558/6172085.pdfIn PDF document text
    • http://nituxesif.tracytomchuk.com/uploads/1/3/0/7/130775537/b15e81b4.pdfIn PDF document text
    • http://files.jayhawkgreatpyrenees.com/uploads/1/3/2/8/132814651/dulofedij_balatup_zonuxosus.pdfIn PDF document text
    • http://tuvasi.harriscreekpta.com/uploads/1/3/1/4/131412290/5423395.pdfIn PDF document text
    • http://dofofipiz.iconiumbackpacker.com/uploads/1/3/0/7/130776021/lakit.pdfIn PDF document text
    • http://files.jubileepainting.com/uploads/1/3/0/9/130969059/9acb91a525167.pdfIn PDF document text
    • http://files.spiritofthelaw.blog/uploads/1/3/0/8/130814642/najugeko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5733/9816/files/banana_bread_unblocked.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0469/9596/4056/files/xuvopifanife.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3397/7247/files/reading_is_fundamental_supernatural.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9452/2523/files/1839204563.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D75 5304 bytes
SHA-256: c03717b230a46d08fb6d0a42c9fd1c4e4a66bc2a9facc3e2597be7cf947be6be
font_01_sfnt_off00005f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F82 10312 bytes
SHA-256: ff19595e99e5b38df022bbda1e7bada44b7a9b60e7fab1339614e36fa349f4e2
font_02_sfnt_off000082d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82D8 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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