Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5749b65ae8cffa7…

MALICIOUS

PDF

38.5 KB Created: 2020-09-05 17:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd54575bc9d1e12e70871fb678a8262c SHA-1: 62a178b0f5b178006f09e7c645b3610e4f4e01c8 SHA-256: d5749b65ae8cffa7d6e5d348d8f0511951d661393b9acc38d3b6cf0024ce881e
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify and static.usrfiles.com domains, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to a known malicious redirector infrastructure at `https://ttraff.link/wix?keyword=mm+cm+m+km+conversion+worksheets`. The document body, though heavily obfuscated, contains this same URL, indicating the primary intent is to redirect the user to malicious content.

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.link/wix?keyword=mm+cm+m+km+conversion+worksheets
    • https://cdn.shopify.com/s/files/1/0437/5245/6346/files/dsssb_result_86_17_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0428/5975/7734/files/low_fodmap_shopping_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/1511/7727/files/39022208215.pdf
    • https://cdn.shopify.com/s/files/1/0429/3863/0300/files/fazilogenupezomidimugolos.pdf
    • https://static.usrfiles.com/ugd/d38238_7f091f9fb9ad40f7a2d0f94a4cfdc32d.pdf
    • https://static.usrfiles.com/ugd/3aee12_9f1af859ee3c4e0a9d2ee54918b0fc45.pdf
    • https://static.usrfiles.com/ugd/ca300b_814aedc8636f427aadad16770e9467b8.pdf
    • https://static.usrfiles.com/ugd/b8c837_771bd48058614aebab9436fb5aa7caeb.pdf
    • https://cdn.shopify.com/s/files/1/0429/0609/1687/files/zeromelugitalakotasotusez.pdf
    • https://cdn.shopify.com/s/files/1/0433/7506/7297/files/87567488044.pdf
    • https://static.usrfiles.com/ugd/b8c837_6b2d0ce8ec3146d986c39318d48955d4.pdf
    • https://static.usrfiles.com/ugd/2274a7_3288aaad820a4e47b22bb40175b02901.pdf
    • https://static.usrfiles.com/ugd/47e66e_9c0d18f7c56c47079460f643ec940731.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_off00005a72.bin
62bf3550117024b01a69bebfdc00ee4d76d4dfc918365a8f7006a796ecb2ae15
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A72 5020 bytes
font_01_sfnt_off00006b80.bin
bc24fa8700a29dc6c9cf14ac227d6643120d0c1a5a78b86e28eb3f0256060470
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B80 9864 bytes