Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a716010087073d2…

MALICIOUS

PDF

40.4 KB Created: 2020-08-29 23:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12d8a823223243a10a9f18378d82b92d SHA-1: a485bceb641ff618e8791d3f43f0e4e38b49b193 SHA-256: 7a716010087073d248601f8a5fb18ebb490a29101e8f33f8e384c302a8016efb
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/wix?keyword=download+eurotrip+2004'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The presence of a large number of external PDF links, many hosted on cdn.shopify.com, suggests a link farm or SEO poisoning attempt to increase the visibility of the malicious redirector. No scripts were extracted, but the malicious link is sufficient evidence for the attack pattern.

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.ru/wix?keyword=download+eurotrip+2004
    • https://static.usrfiles.com/ugd/76156b_41b7d06792574a0b9489bbf51e8b25a0.pdf
    • https://static.usrfiles.com/ugd/b8c837_9ea571d8d70243449f843cf94c0419dc.pdf
    • https://static.usrfiles.com/ugd/b8c837_b4cc2e1d8739428d80427be9b2dc7698.pdf
    • https://cdn.shopify.com/s/files/1/0432/7538/7043/files/44531101907.pdf
    • https://cdn.shopify.com/s/files/1/0440/1453/4806/files/entresto_package_insert.pdf
    • https://cdn.shopify.com/s/files/1/0432/6657/2441/files/tomug.pdf
    • https://cdn.shopify.com/s/files/1/0441/1126/5944/files/tiximenijiti.pdf
    • https://cdn.shopify.com/s/files/1/0434/5485/7369/files/free_manager_chrome_extension_2._1._42.pdf
    • https://cdn.shopify.com/s/files/1/0430/8349/7623/files/6484257094.pdf
    • https://cdn.shopify.com/s/files/1/0430/6799/8362/files/tafafujuba.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_off000060ba.bin
98eea83c758274319d9e8069db02939e47a91cb0d883fe00cbf8222ce2644a1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60BA 5228 bytes
font_01_sfnt_off000072ac.bin
e481313205813c269aa3b88f9712dad95d4b1f266e5ebe620d5536317075cad3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72AC 10120 bytes

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