Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cc1aa79db217933…

MALICIOUS

PDF

57.8 KB Created: 2020-08-03 15:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75f789f96460cd48f7fd2a39f5996e81 SHA-1: 7eea38518589fcefdbed0ea0357ee412a0022cb6 SHA-256: 0cc1aa79db217933a1f711b49ef6b165ab75857280e90183927e035da2305c66
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links, many of which point to external PDF documents, suggesting a link farm for SEO manipulation. One of the embedded URLs, https://ttraff.ru/wb?keyword=lenses%20physics%20notes%20pdf, is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring users to malicious infrastructure through deceptive document content.

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/wb?keyword=lenses%20physics%20notes%20pdf
    • http://files.spiderbikemaps.com/uploads/1/3/1/4/131406412/3131223.pdf
    • http://files.communitycatsofbonitasprings.org/uploads/1/3/1/6/131636923/035855.pdf
    • http://files.mettesterre.com/uploads/1/3/1/4/131407012/kefiborumoteke-bopuveriduxopo-levim-lafikalamaro.pdf
    • http://files.cozipawz.com/uploads/1/3/2/7/132712530/ritirumiruw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/1267/0111/files/mack_truck_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/3830/2627/files/brother_intellifax_2820_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/4347/1010/files/gokigakerifotumupiwivi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0848/2724/files/66450346015.pdf
    • https://cdn.shopify.com/s/files/1/0430/1658/5379/files/87086563764.pdf
    • https://cdn.shopify.com/s/files/1/0428/8492/3555/files/kewuwugukuv.pdf
    • https://cdn.shopify.com/s/files/1/0432/9334/3899/files/venebitoviluvenuzipigide.pdf
    • https://cdn.shopify.com/s/files/1/0432/0880/2466/files/44692486693.pdf
    • https://cdn.shopify.com/s/files/1/0440/2262/8502/files/78533617393.pdf
    • https://cdn.shopify.com/s/files/1/0434/4584/6168/files/14616190695.pdf
    • https://cdn.shopify.com/s/files/1/0433/8316/0995/files/gifaguf.pdf
    • https://cdn.shopify.com/s/files/1/0431/8085/1364/files/53622724999.pdf
    • https://cdn.shopify.com/s/files/1/0430/5174/5442/files/1594943439.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_off00009904.bin
f27606cc6a3f41d474f35e324158c2e9091bfce3672b5fc9ce712cef8a34639a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9904 4948 bytes
font_01_sfnt_off0000a9f0.bin
ee84449f1984b5e6c08e687d67468c82519575447adf094667c0bb586e6772b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9F0 15484 bytes

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