Malicious PDF — malware analysis report

Static analysis result for SHA-256 73451e5dcda0d4c8…

MALICIOUS

PDF

40.4 KB Created: 2020-08-28 12:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fb5e68d43371e879f7166fbd45b040f SHA-1: d83ed84f2330b2fe104fd223339ec772a75c1720 SHA-256: 73451e5dcda0d4c81432dbba6ce38ac99b41ce0de6a1598ccbd8ec87a0764af8
162 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical link redirects to `ttraff.com`, a known malicious redirector, disguised with a lure for 'fl studio 12'. The ML classifier strongly flagged this PDF as malicious, and the presence of a download button heuristic further supports a malicious intent to trick users into clicking the malicious link. No scripts were extracted from this sample.

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.
  • 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://ttraff.com/pify?keyword=94fbr+fl+studio+12
    • http://files.pavlicek-foto.com/uploads/1/3/0/9/130969565/sirejifora.pdf
    • http://katumep.dwarvenworkshop.net/uploads/1/3/1/6/131606782/ff9947d1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4957/3784/files/embryonic_hematopoiesis.pdf
    • https://cdn.shopify.com/s/files/1/0437/8466/7287/files/60009246022.pdf
    • https://cdn.shopify.com/s/files/1/0428/4104/7206/files/powetorezezasi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4922/2298/files/alquimista_libro_completo_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0431/4093/9933/files/nemijuboxeluz.pdf
    • https://cdn.shopify.com/s/files/1/0435/1331/5480/files/xavirogu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0433/8077/files/crafting_guide_f2p_rs3.pdf
    • https://cdn.shopify.com/s/files/1/0433/7188/8803/files/34803322104.pdf
    • https://cdn.shopify.com/s/files/1/0437/2951/8741/files/63662488387.pdf
    • https://cdn.shopify.com/s/files/1/0430/9568/7317/files/88278986696.pdf
    • https://cdn.shopify.com/s/files/1/0439/5394/6782/files/81219738285.pdf
    • https://cdn.shopify.com/s/files/1/0429/7061/1861/files/bixabukunuxalimatupito.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_off0000612b.bin
c2a851d44e228ac636a3a0382e0b9d10f78700ea739e39db8075f8712e7620f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x612B 5164 bytes
font_01_sfnt_off000072c5.bin
a1ad4dd146fbbc8dc85aeb347be661378d90de44230b309972a63ceb839d4457		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72C5 10052 bytes

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