Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dd3701cab0601bf…

MALICIOUS

PDF

42.9 KB Created: 2020-08-08 06:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6eeaf03495b8f2d145b06d141b84d45 SHA-1: 0d3329548b8a63fc8293e99a8dae004858d7adfd SHA-256: 1dd3701cab0601bf3a6ce4ff6baffd672a6f34c77be4a796adc7d8c95d76ee8e
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is designed to lure users into clicking on further malicious content. The document body, though heavily obfuscated, contains references to a 'pilot aptitude test sample pdf' and multiple URLs, including the malicious redirector and a large number of benign-looking Shopify links, suggesting a link farm or SEO poisoning tactic. The ML classifier 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.cc/pify?keyword=pilot+aptitude+test+sample+pdf
    • http://files.floristatwork.com/uploads/1/3/0/8/130873951/5be709887da34e.pdf
    • http://files.thewaveindustries.com/uploads/1/3/1/4/131413837/a1b902b2.pdf
    • http://files.teachingcanadianliterature.com/uploads/1/3/0/8/130874253/befike.pdf
    • http://files.gamblefamilyquarterhorses.com/uploads/1/3/2/7/132741110/zojeluvod.pdf
    • http://files.paysprovencal.com/uploads/1/3/2/6/132683130/7c2a6e5982c26.pdf
    • https://cdn.shopify.com/s/files/1/0430/9961/9492/files/vukofemuxokuwexabiwiwalu.pdf
    • https://cdn.shopify.com/s/files/1/0451/0230/1349/files/postgresql_create_table.pdf
    • https://cdn.shopify.com/s/files/1/0428/4448/7836/files/coeliac_disease_nhs.pdf
    • https://cdn.shopify.com/s/files/1/0437/0612/2393/files/rite_of_baptism_catholic_church.pdf
    • https://cdn.shopify.com/s/files/1/0432/6942/3269/files/lenevanenunoxe.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/vexoxisaximemebu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5657/8206/files/wadadutetuxasesisamofavar.pdf
    • https://cdn.shopify.com/s/files/1/0439/2812/5595/files/www._fedex._com_tracking.pdf
    • https://cdn.shopify.com/s/files/1/0430/1104/7575/files/application_letter_for_a_job_format.pdf
    • https://cdn.shopify.com/s/files/1/0432/3121/5774/files/80383957678.pdf
    • https://cdn.shopify.com/s/files/1/0433/8126/0440/files/faxijafijarutekilir.pdf
    • https://cdn.shopify.com/s/files/1/0437/8198/0317/files/86923934987.pdf
    • https://cdn.shopify.com/s/files/1/0431/2314/6906/files/change_file_to_iphone.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_off00006a3d.bin
d09dfa347863ea6b4e40ead5cbecd8ea615ac8aab0d6fdf7697776ae2bfdcb42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A3D 5092 bytes
font_01_sfnt_off00007b82.bin
b78c12521df51d231d697d3ffda58b64b8abd4b2474f701e18f90f728d855aec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B82 10372 bytes

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