Malicious PDF — malware analysis report

Static analysis result for SHA-256 6342ac5395ccba49…

MALICIOUS

PDF

43.2 KB Created: 2020-08-07 21:05:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 109a6763975cc4365be3c9b7e8d482e2 SHA-1: 13228abbacdbe117252bdcc75486658db30b7416 SHA-256: 6342ac5395ccba49613400114dd0234de1b6b23ffa7a9faccc1417c0f3943f64
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating redirection to known malicious infrastructure. The document body, though partially corrupted, contains a URL pointing to a redirector, suggesting a phishing or malware distribution attempt. The presence of many external links, including benign Shopify links, indicates a link farm strategy to obscure the malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://ttraff.ru/pify?keyword=best+business+plan+books+pdf
    • http://files.wathsportsfan.com/uploads/1/3/2/6/132681969/93f0dd2b61a.pdf
    • http://files.mywhiteprivilege.org/uploads/1/3/1/4/131453998/fapopewulu.pdf
    • http://files.breiderblog.com/uploads/1/3/0/7/130739267/d55c6aa344.pdf
    • http://files.kaufmanautogroup.com/uploads/1/3/2/7/132740743/877867.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/3963/8179/files/bafilitatu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/72645751706.pdf
    • https://cdn.shopify.com/s/files/1/0434/2985/5393/files/35332754097.pdf
    • https://cdn.shopify.com/s/files/1/0429/6717/1223/files/78216455809.pdf
    • https://cdn.shopify.com/s/files/1/0435/3795/7023/files/biperideno_bula.pdf
    • https://cdn.shopify.com/s/files/1/0429/2925/8649/files/98974803789.pdf
    • https://cdn.shopify.com/s/files/1/0430/0016/8597/files/63582946693.pdf
    • https://cdn.shopify.com/s/files/1/0429/7592/0282/files/ccna_routing_and_switching_complete_study_guide_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/8530/7805/files/xunaked.pdf
    • https://cdn.shopify.com/s/files/1/0429/0638/6595/files/appraisal_report_in_mortgage.pdf
    • https://cdn.shopify.com/s/files/1/0428/5543/2348/files/nofedivaxajenesoro.pdf
    • https://cdn.shopify.com/s/files/1/0431/6335/3244/files/senior_auditor_job_description.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5511/files/factors_affecting_tardiness_of_students.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a78.bin
d82f910ac2d34f24911b618506e9bc8be8c11cbc4997138a53791bc921bc7591		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A78 5192 bytes
font_01_sfnt_off00007c39.bin
a140aea42a90d4a8e3447e68ff034ae748bfc8173d384c3e59a25f487e3ca132		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C39 10368 bytes

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