Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd3864e4adebae7…

MALICIOUS

PDF

40.3 KB Created: 2020-11-06 22:49:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: abce29d3171ca2da6ff85b32c650428e SHA-1: 54edac8991d47beaf13928e23d52c6ce78b65f2f SHA-256: cfd3864e4adebae7ab6d9cb79e41e6b8d03704143f53ed4de8a9be4895ca3e4f
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector infrastructure, disguised with a seemingly innocuous keyword. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and the presence of the URL https://cctraff.ru/123?keyword=gorilla+rack+shelving+parts strongly indicate a phishing or scam attempt. The document body, though heavily obfuscated, also contains this URL and other links, suggesting a link farm used to distribute malicious content or host phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://cctraff.ru/123?keyword=gorilla+rack+shelving+parts
    • https://cdn-cms.f-static.net/uploads/4415935/normal_5f9d1506f02b9.pdf
    • https://cdn-cms.f-static.net/uploads/4445333/normal_5f9f0a1a4685c.pdf
    • https://cdn-cms.f-static.net/uploads/4408593/normal_5f9feff9cf060.pdf
    • https://cdn-cms.f-static.net/uploads/4365628/normal_5f875ee3ebd0f.pdf
    • https://cdn-cms.f-static.net/uploads/4374518/normal_5f8a91caf191e.pdf
    • https://cdn-cms.f-static.net/uploads/4389095/normal_5f9fb167f22c6.pdf
    • https://cdn-cms.f-static.net/uploads/4369511/normal_5f8b76c9bb1d4.pdf
    • https://cdn-cms.f-static.net/uploads/4389108/normal_5f9146739d9a3.pdf
    • https://punadojum.weebly.com/uploads/1/3/2/6/132680976/xafavo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nakevoja/ps2_to_usb_adapter_best_buy.pdf
    • https://s3.amazonaws.com/nowokil/judas_contract_terra_death.pdf
    • https://s3.amazonaws.com/nokiva/methods_of_determining_bearing_capacity_of_soil.pdf
    • https://vakonowar.files.wordpress.com/2020/11/728202325.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c51.bin
a91c46c3cde904e92f8cdc52c8c0121bfc5b7bc0b8e3fc9bf6740434867da82c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C51 5352 bytes
font_01_sfnt_off00006e8e.bin
150117a72a0184a94eb11d1893ed5261d0755c9a5d244826688d1bec14d09d77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E8E 11468 bytes

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