Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3ff93929f28b8ab…

MALICIOUS

PDF

43.6 KB Created: 2020-07-28 10:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 376ac13a6acd3d93864c9e7de8473b35 SHA-1: 3b6185fbd1992c54fbb379fdae1d9197127e3a87 SHA-256: e3ff93929f28b8abe3bac4a8f7779d91f4ec7118a94ff8112f16402b9d80c4b2
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.com, disguised as a chapter review. The document body, though heavily obfuscated, contains text related to "Milady chapter 16 review questions answers" and is generated by wkhtmltopdf, suggesting a lure to a phishing or malware site. The presence of a large number of embedded links to external PDFs, many hosted on Shopify, further indicates a link farm or SEO poisoning attempt to drive traffic to malicious destinations.

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.com/pify?keyword=milady+chapter+16+review+questions+answers
    • http://files.musicandartattrinity.org/uploads/1/3/0/8/130813511/waxikij_zimolot_teduvidu.pdf
    • http://files.itanecoleman.com/uploads/1/3/2/8/132816036/987579.pdf
    • http://files.junktheband.com/uploads/1/3/0/7/130740504/16d1f4a75f7e.pdf
    • http://files.apolloartdocent.com/uploads/1/3/1/4/131453512/8441315.pdf
    • http://files.apolloartdocent.com/uploads/1/3/1/4/13145
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/95378981360.pdf
    • https://cdn.shopify.com/s/files/1/0430/2903/7219/files/38461916846.pdf
    • https://cdn.shopify.com/s/files/1/0432/8531/5744/files/58694538188.pdf
    • https://cdn.shopify.com/s/files/1/0434/0360/8231/files/83628928894.pdf
    • https://cdn.shopify.com/s/files/1/0434/0426/3585/files/bejuremupuwatesok.pdf
    • https://cdn.shopify.com/s/files/1/0437/4170/8453/files/64815686928.pdf
    • https://cdn.shopify.com/s/files/1/0431/3183/0421/files/vepemejemimujepob.pdf
    • https://cdn.shopify.com/s/files/1/0429/8617/6665/files/80519534503.pdf
    • https://cdn.shopify.com/s/files/1/0435/5689/6927/files/tegojewezexatela.pdf
    • https://cdn.shopify.com/s/files/1/0431/7492/0347/files/titazazitesujozurazanod.pdf
    • https://cdn.shopify.com/s/files/1/0437/0549/9801/files/79312018385.pdf
    • https://cdn.shopify.com/s/files/1/0431/5666/8573/files/40022687085.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/44368867506.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9483/files/16941793024.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_off00006ca4.bin
8d1b944a8c3a259d114dd195c01138051c5c09ca9ebe588d6810b3e99fd45040		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CA4 5632 bytes
font_01_sfnt_off00007fde.bin
71ad49ba75a91feff4297278597f2104134236db17c9a6d925f090e1f7f55535		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FDE 9744 bytes

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