Malicious PDF — malware analysis report

Static analysis result for SHA-256 099668ae7686ba8f…

MALICIOUS

PDF

38.9 KB Created: 2020-08-18 22:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 74852ad679fecae4809d0e25fc8fe818 SHA-1: 649b6d6e8f7a860f054f0daa6b2a719142005763 SHA-256: 099668ae7686ba8ffe7a02f79d36d60f30611f70cd99f087dc95fa865f60946e
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text related to riddles and includes the malicious URL, suggesting a social engineering lure. The presence of multiple Shopify links, some benign and some potentially malicious, indicates a link farm strategy. No scripts were extracted, but the ML classifier strongly flagged this PDF as malicious.

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=most+toughest+riddles+with+answers
    • http://zafesu.ecolodge-laketiticaca.com/uploads/1/3/1/4/131437940/kelafefuzedopumeb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9938/2170/files/blaze_of_glory_bon_jovi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5319/5165/files/rotafin.pdf
    • https://cdn.shopify.com/s/files/1/0427/7898/4614/files/58733457133.pdf
    • https://cdn.shopify.com/s/files/1/0434/3077/2901/files/92810272478.pdf
    • https://cdn.shopify.com/s/files/1/0428/7230/7875/files/46538873140.pdf
    • https://cdn.shopify.com/s/files/1/0427/9199/3500/files/87438295292.pdf
    • https://cdn.shopify.com/s/files/1/0430/7812/3680/files/logitech_momo_racing_wheel.pdf
    • https://cdn.shopify.com/s/files/1/0440/5487/2214/files/pudufejizefaveta.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_off00005b3f.bin
a7a5e392996b6df4568b8dfe5ec4378b18b5e614d1f3617219ccb351e869d81f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B3F 5184 bytes
font_01_sfnt_off00006cf2.bin
d421d7d1a57ff951d003d6d382eaa15ba8a93a96bfd1e0a93e8de09a8ea9cfe7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CF2 10044 bytes

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