Malicious PDF — malware analysis report

Static analysis result for SHA-256 72356c69fb4f79a9…

MALICIOUS

PDF

41.6 KB Created: 2020-10-08 09:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 99c9618e1863c69ae308134ef4a6ec2e SHA-1: cb2fa8ba64b3dc05f8f0fe200fbec5f00581a208 SHA-256: 72356c69fb4f79a9a0dc364ae372be39e74d2ad6fd7590e548b82ef535561f65
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link

The PDF contains a large number of embedded links, many of which point to disposable domains and appear to be part of a link farm. One of the primary links, 'https://cctraff.ru/strik?keyword=neil+labute+monologues+for+females', is identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL and others, suggesting a social engineering attempt to drive traffic to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cctraff.ru/strik?keyword=neil+labute+monologues+for+females In PDF document text
    • http://files.trinityjoppa.org/uploads/1/3/1/4/131409498/1148706.pdfIn PDF document text
    • http://files.riversidewoodwrights.com/uploads/1/3/2/7/132740978/namunedukev_mapanofelili_nafuzapez_dopanoxumisisiz.pdfIn PDF document text
    • http://nalizajaj.sthomaskensaltown.co.uk/uploads/1/3/1/1/131164093/9666899.pdfIn PDF document text
    • http://xafudive.fhacaurora.org/uploads/1/3/2/8/132815370/7da5b04.pdfIn PDF document text
    • http://muxotawo.j-acevedo.com/uploads/1/3/0/8/130814070/nunam_misuledulozona.pdfIn PDF document text
    • http://files.seizediem.com/uploads/1/3/1/3/131379894/nozapus.pdfIn PDF document text
    • http://files.jdbcs.co.uk/uploads/1/3/1/6/131636632/xajugolip-magajit.pdfIn PDF document text
    • http://ruwidenis.bobclyman-playwright.com/uploads/1/3/1/6/131637014/fepupitamugudiwobuk.pdfIn PDF document text
    • http://rawexe.rachaelhudes.com/uploads/1/3/0/8/130874218/jisepapegubiv_wadopinenigim_rimutiz_nutene.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/1/0429/0645/2127/files/janolipojit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1608/5923/files/wifaludufekobasugodafinu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8526/7097/files/monty_python_shrubbery_meme.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7313/5011/files/85890996642.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_off000065bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65BB 5196 bytes
SHA-256: 8760182b4ca02653711b7a0a3ca9cb29037011c673cdd238eaf7ba29eb5e9381
font_01_sfnt_off0000775b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x775B 10088 bytes
SHA-256: a1e4e1f4de6906ef8455b9e55fdf5788b2207d982e23b708a2ccb2456ed5d929

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