Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcc32246c1144190…

MALICIOUS

PDF

66.8 KB Created: 2020-12-24 03:14:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9249073f7cc65915edcd58346a7e0377 SHA-1: d20862962f27e9e7812203f3bbf0b9e17803e390 SHA-256: dcc32246c1144190fc4b6babaa8ef81e9f9759ccdca511f07ee911e140953ed4
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a redirector link and a link farm. The embedded links, such as 'https://gettraff.ru/123?utm_term=a10+downloader+apk+free+download', likely serve to direct users to malicious sites for phishing or malware downloads. No scripts were extracted, but the extensive link farm suggests a coordinated effort to distribute malicious content.

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-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/123?utm_term=a10+downloader+apk+free+download
    • https://cdn-cms.f-static.net/uploads/4384633/normal_5fc2dd0571f83.pdf
    • https://cdn-cms.f-static.net/uploads/4384029/normal_5f9075685e04e.pdf
    • https://cdn-cms.f-static.net/uploads/4481671/normal_5fc0af40769a0.pdf
    • https://cdn-cms.f-static.net/uploads/4453100/normal_5fba4b7aeb746.pdf
    • https://static.s123-cdn-static.com/uploads/4371809/normal_5fddfa616e283.pdf
    • https://vigasobokaj.weebly.com/uploads/1/3/4/6/134619364/2093733.pdf
    • https://xixemoxutosiseg.weebly.com/uploads/1/3/4/4/134473276/638027.pdf
    • https://fuloremazugad.weebly.com/uploads/1/3/4/3/134356453/fapovobot.pdf
    • https://cdn-cms.f-static.net/uploads/4372985/normal_5fa424c830a96.pdf
    • https://cdn-cms.f-static.net/uploads/4387412/normal_5f987958b97e3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bee925d2-f7e4-4bcd-8bd2-3fa9467bc09a/samsung_sm-t230_service_manual.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_off0000c66c.bin
6d873e93f909875a3419c15235cc74cef9cec64ffa8eeebf4bcffabe7e8ce28d
pdf-font-stream PDF embedded font (sfnt) at offset 0xC66C 5196 bytes
font_01_sfnt_off0000d845.bin
eb8e44f7a7ad752ef5f58b825151ce14aad5812f86489801fe530fcde21e3e4b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD845 11488 bytes