Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d6d164c73e66df6…

MALICIOUS

PDF

40.8 KB Created: 2020-08-19 09:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed221e50351144e553902f031db84bf4 SHA-1: 747148bf8711198738d7c54386b3fe095790b813 SHA-256: 0d6d164c73e66df6e6664b6bd2b1781eddd9bb3b56326bf1a8e4ecc3d2cbdde9
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and contains numerous embedded links. A critical heuristic identified a link to a known malicious redirector, and another heuristic noted a large number of external PDF links, indicating a potential link farm or SEO manipulation strategy. The document body contains generic text and URLs, but the primary malicious activity appears to be the distribution of links.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=corrugated+roofing+sheets+green
    • http://files.dental-medical-connections.com/uploads/1/3/0/9/130969768/wakitexol-zimiramujexuvov.pdf
    • http://nabunojo.djs-essex.co.uk/uploads/1/3/1/3/131398003/bikatubaginoje_rojuz_vimulevikalugur.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/4294/7751/files/alessandro_barbero_costantino_il_vincitore.pdf
    • https://cdn.shopify.com/s/files/1/0432/4596/1383/files/wovoz.pdf
    • https://cdn.shopify.com/s/files/1/0429/8250/6647/files/bissell_proheat_clearview_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/7618/2426/files/kugulidoxejaxirawe.pdf
    • https://cdn.shopify.com/s/files/1/0434/7209/3336/files/89052383906.pdf
    • https://cdn.shopify.com/s/files/1/0437/1605/1109/files/80145105672.pdf
    • https://cdn.shopify.com/s/files/1/0429/7680/5018/files/vilosibameludit.pdf
    • https://cdn.shopify.com/s/files/1/0434/9827/4978/files/pisubupedok.pdf
    • https://cdn.shopify.com/s/files/1/0428/7633/8335/files/horde_1-_60_leveling_guide_classic.pdf
    • https://cdn.shopify.com/s/files/1/0451/1770/2298/files/synthesis_and_characterization_of_zno_nanoparticles.pdf
    • https://cdn.shopify.com/s/files/1/0429/9217/3217/files/94220243619.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_off0000612f.bin
11850ac46d51d2dd3993d79414890668f1931a7db6bfcc4d62af31d772834d7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x612F 5044 bytes
font_01_sfnt_off00007251.bin
6c075180627790d9ef2cb25dd0af24a37b2dd17336151dd044e026f44f34a2ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7251 10816 bytes

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