Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc502a280eba3ee…

MALICIOUS

PDF

73.4 KB Created: 2021-01-06 14:14:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dad5f08723dcb83ce337ae80482659ff SHA-1: be87c2724817bde6be6d746916c9c3a01bca80b4 SHA-256: cfc502a280eba3ee9d3bd6b851d2c5b09e4dd0678d5a3afbccf49aa5ebb84d4f
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a link farm and a redirector to malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or a scam. The embedded URLs, particularly the one pointing to 'gettraff.ru', are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=peak+performance+jacka+vinter+herr
    • https://cdn-cms.f-static.net/uploads/4402718/normal_5fa893776935b.pdf
    • https://dawemewi.weebly.com/uploads/1/3/4/7/134747996/3896474.pdf
    • https://sugulidan.weebly.com/uploads/1/3/4/5/134508933/d14581e6.pdf
    • https://cdn.sqhk.co/muresogus/FfHjjiW/nitro_rc_car_fuel_tank.pdf
    • https://subilitukufune.weebly.com/uploads/1/3/4/6/134629352/59c42.pdf
    • https://cdn-cms.f-static.net/uploads/4374535/normal_5f8a9c7e292df.pdf
    • https://lemamoramu.weebly.com/uploads/1/3/5/3/135348447/walid_gadeburakimifuj_kisuzazojum.pdf
    • https://cdn-cms.f-static.net/uploads/4413108/normal_5feaefb8c2196.pdf
    • https://static.s123-cdn-static.com/uploads/4373527/normal_5fdd7c606d0b1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tesotiwapax/actors_access_logo.pdf
    • https://s3.amazonaws.com/sodoxi/personal_balance_sheet_template_uk.pdf
    • https://s3.amazonaws.com/xovekolamoxe/talent_guide_divinity_original_sin_2.pdf
    • https://s3.amazonaws.com/tabobujimo/tamil_actor_movies_2018.pdf
    • https://s3.amazonaws.com/dogazisuze/cdip_exam_study_guide.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_off0000e3c1.bin
00c3ad5651e492e42a2dc9ee1f94ca9139e589ef7bd3229746e8c66d48d6cfa5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C1 5248 bytes
font_01_sfnt_off0000f581.bin
c237e02941dd8afca66333ea28bb2d326870649a8776cffea558da7def8492a5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF581 10172 bytes