Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3b83a74805c347f…

MALICIOUS

PDF

45.7 KB Created: 2020-08-06 12:32:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6923a93b40217716e37b1a8f869459d SHA-1: 8243b791b2062e66b29e30e08c9b5a5d100f9299 SHA-256: e3b83a74805c347ffd22231715aa1e73437aee96b76757661290d5e27e1517fb
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a significant number of embedded links, with one critical heuristic identifying it as a link farm pointing to known malicious redirector infrastructure. The primary malicious URL identified is https://ttraff.cc/pify?keyword=just+already+still+yet+pdf. The document body is heavily obfuscated and contains numerous URLs, many of which are benign Shopify links, but the presence of the malicious redirector and the sheer volume of links suggest a malicious intent, likely for SEO manipulation or traffic redirection.

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=just+already+still+yet+pdf
    • http://files.poderpac.com/uploads/1/3/0/7/130776828/xowanaxud.pdf
    • http://files.harvardseducation.com.au/uploads/1/3/1/4/131438439/9943811.pdf
    • http://files.allgirlsstemsociety.org/uploads/1/3/0/9/130969437/6287389.pdf
    • http://files.dthomastraining.com/uploads/1/3/1/0/131070152/nejuwupovonenif.pdf
    • http://files.lord-and-associates.com/uploads/1/3/1/3/131384771/90f276dd89b.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8090/files/sociology_101_final_exam_questions.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/39858795743.pdf
    • https://cdn.shopify.com/s/files/1/0432/0781/9422/files/xajosunizemamuzijofipumop.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/2007573522.pdf
    • https://cdn.shopify.com/s/files/1/0428/9606/4671/files/32315495772.pdf
    • https://cdn.shopify.com/s/files/1/0449/9665/7320/files/minoko.pdf
    • https://cdn.shopify.com/s/files/1/0427/7737/8972/files/76839812940.pdf
    • https://cdn.shopify.com/s/files/1/0431/4506/8699/files/walisolovatusavoxano.pdf
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/newofipopapiwenuwula.pdf
    • https://cdn.shopify.com/s/files/1/0431/7026/7291/files/wikilez.pdf
    • https://cdn.shopify.com/s/files/1/0439/4736/0414/files/apple_keyboard_symbols.pdf
    • https://cdn.shopify.com/s/files/1/0430/8297/3346/files/1609033191.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070b9.bin
8badd159efd1d2895ad232cd026760904d3684cc44f917a1afa33fa1f6e0d377		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70B9 5128 bytes
font_01_sfnt_off00008244.bin
600ffe84229e6837c0750c7910a2886f438e64d165b7dd166a45e642b66845dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8244 13028 bytes

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