Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ccfc9419bf15a82…

MALICIOUS

PDF

39.7 KB Created: 2020-08-23 23:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39236766855b3a26fe4942fd5d1e0bc8 SHA-1: 948931c3a61ce8ecde60dfb4456b15162e4c9821 SHA-256: 5ccfc9419bf15a8249971e89d54b31bc58cbdf0a4bc60735ea238431f2c383dc
154 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 Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is also present in the document body. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful sites.

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=math+worksheets+grade+7+and+8
    • http://begewiri.damselflyyogaspa.com/uploads/1/3/0/7/130776447/pazelotovepiw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/3323/0488/files/weather_marysville_wa.pdf
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/audit_report_format_of_llp_2018.pdf
    • https://cdn.shopify.com/s/files/1/0435/0754/8326/files/assam_tet_assamese_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/9820/1502/files/5846232202.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rojifibopi.pdf
    • https://cdn.shopify.com/s/files/1/0434/7212/6117/files/surface_area_and_volume_of_rectangular_prisms.pdf
    • https://cdn.shopify.com/s/files/1/0437/8404/4705/files/lapaxuresukixeg.pdf
    • https://cdn.shopify.com/s/files/1/0434/6360/6429/files/al_east_standings.pdf
    • https://cdn.shopify.com/s/files/1/0434/4355/2416/files/bazuri.pdf
    • https://cdn.shopify.com/s/files/1/0434/2710/2887/files/tuwetujajapoxidumunijufif.pdf
    • https://cdn.shopify.com/s/files/1/0429/9279/5801/files/vifatuja.pdf
    • https://cdn.shopify.com/s/files/1/0434/2549/7239/files/lowes_starkville_ms.pdf
    • https://cdn.shopify.com/s/files/1/0436/1352/0029/files/70054668041.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_off00005e1c.bin
baa8dff9e5dbd74a4ad406256f1a4d1a6ad033ba17fb92ea687ee7d875311cd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E1C 5492 bytes
font_01_sfnt_off000070e1.bin
efee973d26cb9e65a1437bf866ac0512d5379ab9f0225f3c0b1437c96b8225ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x70E1 9760 bytes