Malicious PDF — malware analysis report

Static analysis result for SHA-256 11b1d9b615e013d2…

MALICIOUS

PDF

63.9 KB Created: 2020-07-30 06:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a9ff73c2438975cc4fcd66a657117a2 SHA-1: e6a4ad0b23d75e95db912ee8a23ce6fcc8d1da72 SHA-256: 11b1d9b615e013d234f7627903379c6548605c24a6befc7bdb683b4228767d63
154 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics as malicious, specifically for containing a large number of external links, many of which point to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content. The presence of numerous links, including one to a known malicious redirector, indicates a likely attempt to lure users to malicious websites, potentially for phishing or malware distribution.

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.cc/pify?keyword=abdomen+agudo+medico+y+quirurgico+en+pediatria+pdf
    • http://files.dj-b-fore.com/uploads/1/3/1/4/131483031/puzajawe-debotalojuro.pdf
    • http://files.razfoto.com/uploads/1/3/0/7/130775712/85ff9cefc0635a.pdf
    • http://files.artisticconquests.com/uploads/1/3/0/9/130969695/2fde6944ddb32e.pdf
    • http://files.mendyourbodymassage.com/uploads/1/3/1/4/131484133/1287726.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0365/7887/files/bomefebov.pdf
    • https://cdn.shopify.com/s/files/1/0432/1440/5793/files/88938254117.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gumuwajufutoz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/16175378270.pdf
    • https://cdn.shopify.com/s/files/1/0430/9309/8660/files/57289922774.pdf
    • https://cdn.shopify.com/s/files/1/0430/1130/9719/files/57982889105.pdf
    • https://cdn.shopify.com/s/files/1/0436/0355/8564/files/25954083387.pdf
    • https://cdn.shopify.com/s/files/1/0430/5174/5442/files/wozusujodapogomadenomolas.pdf
    • https://cdn.shopify.com/s/files/1/0435/7799/9519/files/sonikuzesuzavufomoda.pdf
    • https://cdn.shopify.com/s/files/1/0429/0537/0787/files/67447173440.pdf
    • https://cdn.shopify.com/s/files/1/0437/5868/2273/files/rowukefilerod.pdf
    • https://cdn.shopify.com/s/files/1/0429/7284/0090/files/gipumilasaboxirutezuz.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_off0000b99f.bin
65208da5d5cb1f91c6cc594f583c3065d8ccc5b14beafbcdd8220071194dc618		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB99F 5504 bytes
font_01_sfnt_off0000cc38.bin
7a1f2f05c9f7acc60a7252ff08cc7a204841c1e6027de1910580033599c713ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC38 11860 bytes

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