Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1d681001d859385…

MALICIOUS

PDF

76.9 KB Created: 2020-12-23 15:41:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 655bf5b4e82ccad87dbe8d396ed69a9a SHA-1: d4ec4281adae58df13f151894842149924c2c1e7 SHA-256: d1d681001d859385e983d32e12114b1630d8c196f981eecf680a79bab822d310
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are likely part of a link farm designed to obscure malicious activity. One critical heuristic indicates the PDF links to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to video game cheats, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/strik?utm_term=battletanx+global+assault+ps1+cheats In PDF document text
    • https://cdn-cms.f-static.net/uploads/4414494/normal_5fd0f32e70840.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477626/normal_5fcce39ae3f31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384632/normal_5f8c6bed78b58.pdfIn PDF document text
    • https://sojimivur.weebly.com/uploads/1/3/4/8/134883767/ffd90a4f6fd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425921/normal_5fbee09e15721.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421051/normal_5fb722af4b65a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384026/normal_5fa125e75fafc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404725/normal_5fe2d283ceffa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415045/normal_5fba6ab168a79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453890/normal_5fbe10dd40cf7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451369/normal_5fcf10137c47e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/transmission_speed_sensor_replacement_cost.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/52962724741.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000fef4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFEF4 23408 bytes
SHA-256: f65eefae4c58477a2ee5afb17c2cf6efbcb47aedfaa060aac1cbca9ee10d2c97
font_00_sfnt_off0000c82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82B 5408 bytes
SHA-256: 79a8fb90370856c5f79fd101d892b20578f088b9e713fcb5dbc869fa6eff6540
font_01_sfnt_off0000da9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9D 10664 bytes
SHA-256: 7e9cb67eecf273090bc26d8cf35fe8215c5d87a176de2cd4ff76fb8ccfa163f9

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