Malicious PDF — malware analysis report

Static analysis result for SHA-256 321a9530ab1ebfa8…

MALICIOUS

PDF

33.1 KB Created: 2020-08-04 14:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cb2d1cc7dd4071870bb97485fc055b6 SHA-1: 6e8aab7d33981494785c8c0f95b88503dcf190bc SHA-256: 321a9530ab1ebfa86a298185714e0733723f9b4ceb7c47ba7a8a03d0b5efb039
152 Risk Score

Malware Insights

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

The PDF document contains a critical heuristic firing for a malicious redirector link, specifically 'https://ttraff.ru/pify?keyword=altivar+11+instrukcja+pdf'. Additionally, it exhibits a PDF link farm with numerous external links, many pointing to Shopify domains, suggesting an attempt to manipulate search engine results or distribute content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of a malicious redirector and link farm points to a phishing or content distribution attack.

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/pify?keyword=altivar+11+instrukcja+pdf
    • http://files.cosmogonyart.com/uploads/1/3/2/8/132815767/sixizisazav-tovadipafidoput-wizevuf-wotafumuwupiza.pdf
    • http://nupudopal.myaustraliannews.com.au/uploads/1/3/1/4/131407233/kozoxexipuge.pdf
    • http://tazuke.positiveimpact4health.com/uploads/1/3/1/4/131452922/nawibavoseladatut.pdf
    • http://files.frhsbands.org/uploads/1/3/2/6/132695556/bebepetadimuwibole.pdf
    • http://fawajigov.rrdiamondsdanceteam.com/uploads/1/3/0/7/130739625/lanoxofimalo.pdf
    • https://cdn.shopify.com/s/files/1/0440/7102/6853/files/rpa_robotic_process_automation.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/ligumugazawebamupewav.pdf
    • https://cdn.shopify.com/s/files/1/0429/5085/2762/files/85879637921.pdf
    • https://cdn.shopify.com/s/files/1/0440/3609/6150/files/17248448060.pdf
    • https://cdn.shopify.com/s/files/1/0429/3813/8783/files/systemic_risk.pdf
    • https://cdn.shopify.com/s/files/1/0433/4852/5206/files/73757523276.pdf
    • https://cdn.shopify.com/s/files/1/0433/8892/8150/files/72586973269.pdf
    • https://cdn.shopify.com/s/files/1/0428/6955/5356/files/robubevidudokuvabuf.pdf
    • https://cdn.shopify.com/s/files/1/0431/5915/8938/files/70312043280.pdf
    • https://cdn.shopify.com/s/files/1/0431/0165/1101/files/pazetatakuzosujasupixap.pdf
    • https://cdn.shopify.com/s/files/1/0436/2688/9369/files/98399353717.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_off00004688.bin
e4a0a76cb4fddaf95e664d3bc56e8a763b93521b1a21320b1dd833bcb4c0e793		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4688 5392 bytes
font_01_sfnt_off00005905.bin
ba5d35ec4bf46264543e5d10c911ff987bd3d1eb5719662c617b488f0d8ba101		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5905 8956 bytes

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