Malicious PDF — malware analysis report

Static analysis result for SHA-256 494a4e5da1fa5823…

MALICIOUS

PDF

44.5 KB Created: 2020-08-14 04:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2af25d14df61500a385c0017adec4238 SHA-1: ca3aee10f2b1a7f7759651f1b9b01ac1b5d7a299 SHA-256: 494a4e5da1fa5823a239ee790a30619ed6b371026608dbb283833878f7ad8078
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body also contains this URL, suggesting a lure to a malicious site disguised as a technical document. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy, likely for SEO poisoning or distributing further malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=high+voltage+breakdown+tester+pdf
    • http://files.madlyeclectic.com/uploads/1/3/1/4/131483253/nuwitoduku_xafozovininu_lekilirox_navagad.pdf
    • http://files.gaatn.org/uploads/1/3/1/4/131437307/2f02f.pdf
    • http://files.naicob.org/uploads/1/3/0/8/130814065/f842d85782c.pdf
    • http://files.graemation.nz/uploads/1/3/0/9/130969430/3717731.pdf
    • http://files.mythnmagik.com/uploads/1/3/1/4/131453784/fibezewuvefer-kuvem-dubidefeme.pdf
    • https://cdn.shopify.com/s/files/1/0430/6262/4405/files/basezewatepadigegodud.pdf
    • https://cdn.shopify.com/s/files/1/0430/2913/5521/files/vegetables_names_in_arabic_and_english.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zekimopesafirizaxos.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/ipv6_address_generator.pdf
    • https://cdn.shopify.com/s/files/1/0436/9114/7417/files/bowanojareref.pdf
    • https://cdn.shopify.com/s/files/1/0438/9116/3291/files/5129159766.pdf
    • https://cdn.shopify.com/s/files/1/0435/6849/6798/files/mijudowukosu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8520/9507/files/bsc_1st_year_physics_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/9563/7659/files/48252195447.pdf
    • https://cdn.shopify.com/s/files/1/0433/9207/3895/files/polisacaridos_almidon.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_off00006958.bin
41c526f0ad7f6afe3ec6cf75e968df292227f36b7b72997ceec7aee1f95fa241
pdf-font-stream PDF embedded font (sfnt) at offset 0x6958 5620 bytes
font_01_sfnt_off00007c7d.bin
68de3e1f6035a9a4b110ecbf5e5c31dd198b34045d703ee557fe34e4b7947f09
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C7D 12464 bytes