Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fae9f31e36b4471…

MALICIOUS

PDF

39.7 KB Created: 2020-09-03 05:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb37f0754a21ae3dcedd602ec074aef8 SHA-1: 8083beb70cd1933c83b38a6be5b9701bb8b1d49e SHA-256: 4fae9f31e36b4471c8fcead0e336afd3fe0919b48c0ddb02a74e69dda222b00e
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to a known malicious redirector. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many pointing to Shopify. The primary malicious URL is ttraff.me, which is used in conjunction with a keyword search, suggesting a potential SEO poisoning or spamming tactic. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the malicious redirector and the link farm structure strongly suggest a malicious intent to drive traffic to harmful sites.

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.me/wix?keyword=holy+bible+in+english+free++pdf
    • https://cdn.shopify.com/s/files/1/0429/6153/5132/files/business_model_canvas_strategyzer.pdf
    • https://cdn.shopify.com/s/files/1/0440/7004/3813/files/allianz_pet_insurance_claim_form_uk.pdf
    • https://cdn.shopify.com/s/files/1/0431/7157/8007/files/livro_principios_da_administrao_cientifica.pdf
    • https://cdn.shopify.com/s/files/1/0432/5654/5433/files/el_aleph_jorge_luis_borges_libro.pdf
    • https://cdn.shopify.com/s/files/1/0461/6129/7560/files/upper_extremity_arterial_doppler_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0439/3952/8872/files/alternative_splicing_mrna.pdf
    • https://static.usrfiles.com/ugd/0ad6c7_0064a5c59d3d4e8cbc981179d7a92469.pdf
    • https://static.usrfiles.com/ugd/9904c2_a8bdb7e38a8642ee8db91cb23bc5b5e4.pdf
    • https://cdn.shopify.com/s/files/1/0432/2426/8968/files/90915577735.pdf
    • https://cdn.shopify.com/s/files/1/0433/4066/0891/files/93305864015.pdf
    • https://cdn.shopify.com/s/files/1/0428/3655/7987/files/jisimegutis.pdf
    • https://cdn.shopify.com/s/files/1/0428/5153/2963/files/46995094769.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_off00005d3c.bin
643b37f0770000706472bd9afb67a9024cd4ecefa3e4ee03d8f6e8de4b8848fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D3C 5296 bytes
font_01_sfnt_off00006f3f.bin
55c7d99a498a01ae28d95fd0fce4413abc4475d9f6f1e6b98cd1f6fe054be2c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F3F 10228 bytes