Malicious PDF — malware analysis report

Static analysis result for SHA-256 650e13071b3b89e4…

MALICIOUS

PDF

68.0 KB Created: 2020-12-07 15:56:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b4bbc7a9061af88342aec23a0d5fbb3 SHA-1: d5d29de34cf9e9fee1bea47ed5d3c579399f660c SHA-256: 650e13071b3b89e4421fedadbfdb6193081505d5d4b96b0ca3c92fe8e3e02c59
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 a URL disguised as an app download. The ML classifier and ClamAV also flagged this PDF as malicious. While no scripts were extracted, the embedded URL and the nature of the heuristics strongly suggest a phishing attempt to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gettraff.ru/aws?utm_term=free+international+wifi+calling+app+for+android
    • https://cdn-cms.f-static.net/uploads/4422637/normal_5f9ca22db868d.pdf
    • https://cdn-cms.f-static.net/uploads/4365606/normal_5f8ea0d3bb1dd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xixonu/jobuxasawikazev.pdf
    • https://s3.amazonaws.com/tudawufed/clarity_xlc3.4_amplified_cordless_phone_manual.pdf
    • https://s3.amazonaws.com/fuwenoxuzasila/16714365804.pdf
    • https://s3.amazonaws.com/wovugi/best_antivirus_for_computer_free.pdf
    • https://s3.amazonaws.com/zabevog/shelby_funeral_home_in_east_prairie_mo.pdf
    • https://uploads.strikinglycdn.com/files/b2400741-ca50-4428-8603-c55d9e28fd1d/99036606712.pdf
    • https://s3.amazonaws.com/jevelel/17767801728.pdf
    • https://static1.squarespace.com/static/5fc5c6e78ef7301f8b326b4b/t/5fc91e047e4f2143902850b2/1607015940276/chromecast_vs_built_in_apps.pdf
    • https://uploads.strikinglycdn.com/files/568b1db7-5a30-4590-9cee-7a27fc36d51c/24990038098.pdf
    • https://s3.amazonaws.com/tigovatolis/fromm_dog_food_feeding_guidelines.pdf
    • https://uploads.strikinglycdn.com/files/c2515266-7b17-49f8-9c9d-4ababea70410/34379559267.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_off0000cc99.bin
b94d5d98f574aad7d7084826e8535dedc69d4cac029992ecd5ae0b02f4e32efa
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC99 5192 bytes
font_01_sfnt_off0000de6a.bin
bcf1e67b9f9424781e072eed13e7ff5e7e052c6672b2cf8dde08f5f392d32ce3
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6A 10796 bytes