Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ce71d0a1dfa0a88…

MALICIOUS

PDF

67.9 KB Created: 2020-11-24 05:14:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 567ce105d40cf760191b94fe51f88d41 SHA-1: 75747afee26a1ca9750722bfb161310f9a9d9cab SHA-256: 7ce71d0a1dfa0a88fa48508203f8b167f7160ab528d72488a2be9742cbe58c79
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://gettraff.ru/strik?utm_term=msi+b75ma+e33'. Additionally, it exhibits characteristics of a PDF SEO link farm, containing numerous external PDF links. This suggests the document's primary purpose is to lure users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the presence of malicious links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-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/strik?utm_term=msi+b75ma+e33
    • https://cdn-cms.f-static.net/uploads/4417118/normal_5fa1097975803.pdf
    • https://fuletufaxesuli.weebly.com/uploads/1/3/4/5/134523612/5869393.pdf
    • https://cdn-cms.f-static.net/uploads/4391024/normal_5f95c094c188e.pdf
    • https://cdn-cms.f-static.net/uploads/4366063/normal_5f8860512f16d.pdf
    • https://cdn-cms.f-static.net/uploads/4389097/normal_5f9068ea57554.pdf
    • https://cdn-cms.f-static.net/uploads/4424024/normal_5fada00ad4cdc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tixeligufokup/disokow.pdf
    • https://s3.amazonaws.com/pafiganovavi/whitepages_premium_apk.pdf
    • https://uploads.strikinglycdn.com/files/ece72f04-86df-4ce0-bf2c-aecde78b6562/boxes_and_bullets_organizer.pdf
    • https://s3.amazonaws.com/nonabafat/rule_number_1_phil_town.pdf
    • https://s3.amazonaws.com/mubefula/resigezivazu.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_off0000cb92.bin
bf3f92d92b2fb7d01e9ada01ab86f6e9abe753b5e638371c8506d8912365d50e
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB92 5216 bytes
font_01_sfnt_off0000dd5b.bin
7b157c3e46fb153a56113a660540f1c1eb1705a38e2793400c0ab6d517f28444
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5B 10868 bytes