Malicious PDF — malware analysis report

Static analysis result for SHA-256 22f56f11ac29e32c…

MALICIOUS

PDF

59.1 KB Created: 2020-08-12 18:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1cbf4b66ca89bd87e8282b82083fa675 SHA-1: f43e86d165a81c6d3f670c1e6f607a94e86c9c95 SHA-256: 22f56f11ac29e32c704d782256bdc2a17bdbd5566d10071dbec6e62127b1b47a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on 'cdn.shopify.com'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting the primary intent is to redirect the user to potentially harmful 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.com/pify?keyword=varices+esofagicas+fisiopatologia+pdf
    • http://files.marshallilchamber.com/uploads/1/3/1/3/131380849/zigokugere_xuwimuburog_muxas_fujivuge.pdf
    • http://files.photorinovsky.com/uploads/1/3/1/4/131406827/vogarezolarizubokula.pdf
    • http://files.elawr.org/uploads/1/3/2/6/132681030/18fb05.pdf
    • http://files.toniblackmanpresents.com/uploads/1/3/1/8/131856646/5175594.pdf
    • http://files.miotculturalprogramme.com/uploads/1/3/0/8/130874566/7350617.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5275/files/tevag.pdf
    • https://cdn.shopify.com/s/files/1/0437/0910/4279/files/interstate_battery_catalog.pdf
    • https://cdn.shopify.com/s/files/1/0448/4697/3088/files/concepto_de_estadistica_descriptiva_e_inferencial.pdf
    • https://cdn.shopify.com/s/files/1/0437/1814/8261/files/leritawimesodevalu.pdf
    • https://cdn.shopify.com/s/files/1/0436/0221/5069/files/vepotowo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0299/4586/files/dejufomufoki.pdf
    • https://cdn.shopify.com/s/files/1/0431/3926/8770/files/kaxasamowozuwugu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6585/1542/files/mumavipasaduf.pdf
    • https://cdn.shopify.com/s/files/1/0436/0162/5252/files/77822287192.pdf
    • https://cdn.shopify.com/s/files/1/0431/0227/3697/files/lisijivodalumekunetunuvuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/7047/9768/files/bagusugonapomipika.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_off0000a16d.bin
8ce663bd6537aca97910fbe515fa63d742b7ff26dde695799a1df41bcc88b1c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA16D 5288 bytes
font_01_sfnt_off0000b377.bin
c9ef8bed991f5a153d3d45d75db1df3aeb10a47b9cb29878e6c5bf0592f24379		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB377 13492 bytes

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