Malicious PDF — malware analysis report

Static analysis result for SHA-256 615060903c2b40e6…

MALICIOUS

PDF

63.6 KB Created: 2020-08-17 14:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af9d1d10a5b64ea36a44b8e2637812e2 SHA-1: b64f0ed9e893e12d61f8ee641b647b63a3579145 SHA-256: 615060903c2b40e65586dd96dba4933a885f6485b0b84fbda886907846b0a897
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at `https://ttraff.cc/pify?keyword=cambridge+english+exam+pdf`. The document body, though heavily obfuscated, also contains this URL, indicating a lure to download potentially malicious content. The ML classifier strongly supports the malicious verdict.

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=cambridge+english+exam+pdf
    • http://files.vtstarter.com/uploads/1/3/1/4/131454719/kimakinoxuxo.pdf
    • http://files.dianneforsythphotography.com/uploads/1/3/1/6/131606482/87035.pdf
    • http://files.garyantleproductions.com/uploads/1/3/0/9/130970004/6b5d15.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6341/8784/files/cheat_engine_6._7_apk_android.pdf
    • https://cdn.shopify.com/s/files/1/0433/0576/2974/files/fofur.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/womosoravitixugefiwil.pdf
    • https://cdn.shopify.com/s/files/1/0439/2399/6840/files/lafoguramawavemepuxix.pdf
    • https://cdn.shopify.com/s/files/1/0434/3804/7384/files/40811378193.pdf
    • https://cdn.shopify.com/s/files/1/0432/3383/7219/files/45284973056.pdf
    • https://cdn.shopify.com/s/files/1/0435/4070/9527/files/verupuw.pdf
    • https://cdn.shopify.com/s/files/1/0432/7079/9510/files/duvegofokamituveb.pdf
    • https://cdn.shopify.com/s/files/1/0439/1872/1192/files/buwaxadomodubelule.pdf
    • https://cdn.shopify.com/s/files/1/0429/6900/6236/files/wugupivezoretim.pdf
    • https://cdn.shopify.com/s/files/1/0432/2980/6759/files/17654000957.pdf
    • https://cdn.shopify.com/s/files/1/0437/5783/0298/files/79004170092.pdf
    • https://cdn.shopify.com/s/files/1/0448/1263/2221/files/how_to_crop.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_off0000bb43.bin
d6c542e55d28e2b507ebb4a995f00311789ee2551c76db3a96ae996cc241373e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB43 5568 bytes
font_01_sfnt_off0000ce04.bin
72fe2bf43bd47b5c96e87124bf9158bd7a15d055d1573cd00f4883d12eadb5a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE04 10472 bytes

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