Malicious PDF — malware analysis report

Static analysis result for SHA-256 f994f735bd61d5ff…

MALICIOUS

PDF

68.9 KB Created: 2021-01-05 20:08:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f81411d3c7847a95f5d9e84231479e0a SHA-1: 7b79c201d2c5b61df5e4dfac1844b61230878636 SHA-256: f994f735bd61d5ff67e7e581fc932ee9305a3db05be220d10bd49c34649fd081
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ggtraff.ru'. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of a malicious URL suggests an attempt to lure the user to a compromised site, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://ggtraff.ru/aws?utm_term=clock+and+calendar+aptitude+questions+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4366388/normal_5fdfabc337d60.pdfIn PDF document text
    • https://cdn.sqhk.co/liralimujote/aXjc4ie/55249826773.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosewude/jeijwij/td_auto_insurance_calgary.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372072/normal_5f998a09ac07c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/67da0b3c-2add-4f8f-8923-73ecdd3bbbdd/undertale_text_box_generator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7319cd1f-3f08-41e0-aee3-4d8f4e4a65ab/pikitaxukukujotepulan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94406cc0-4545-4f62-a1a4-eb19a401014d/kijifibilovemi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e146c0c3-f350-475e-bb1a-6004b7e5b243/6265019332.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6060da34-f014-4753-bf0c-f482fccd1a39/nasovurolizube.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBF 5244 bytes
SHA-256: 8d3d1b64235d246f8206a4d536f5b9ba70209ef7e741efb662d57eec129015f9
font_01_sfnt_off0000dfa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA4 11392 bytes
SHA-256: aa1c55beed1a0d4a964141717c5035ded44628a59d8903fb3f8170c0c6285801