Malicious PDF — malware analysis report

Static analysis result for SHA-256 431ced9819977d47…

MALICIOUS

PDF

86.1 KB Created: 2020-11-11 14:46:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 70d6ab210d08355914357ed6f1e191a2 SHA-1: 7571764304554825fbddd533574d8b06ef05b1fe SHA-256: 431ced9819977d47dea0d721675a2dafbdc2283a2ddb5108687d23a47ab1fac1
214 Risk Score

Malware Insights

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

The sample was flagged by multiple critical heuristics as a malicious redirector and link farm, indicating a phishing or malware distribution attempt. The embedded links, such as 'https://gettraff.ru/aws?utm_term=fun+drawing+personality+tests+ice+breakers', likely lead to malicious content. The ClamAV detection and ML classifier further support its malicious nature, suggesting it's a phishing trojan.

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-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=fun+drawing+personality+tests+ice+breakers
    • https://xetutinafo.weebly.com/uploads/1/3/0/7/130775845/8857975.pdf
    • https://cdn-cms.f-static.net/uploads/4391634/normal_5f9eceeed8f7b.pdf
    • https://cdn-cms.f-static.net/uploads/4369310/normal_5f8d57581c95f.pdf
    • https://cdn-cms.f-static.net/uploads/4383916/normal_5fa127cad4862.pdf
    • https://cdn-cms.f-static.net/uploads/4377377/normal_5f94ebbde1e2e.pdf
    • https://cdn-cms.f-static.net/uploads/4372105/normal_5f8c4ebd7706f.pdf
    • https://cdn-cms.f-static.net/uploads/4375350/normal_5f92720235e8e.pdf
    • https://cdn-cms.f-static.net/uploads/4369311/normal_5f88d185598bc.pdf
    • https://cdn-cms.f-static.net/uploads/4393785/normal_5f98581b97f18.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/62ef6e71-1839-445f-9345-e9f3fadd8a1e/joviwekududamirafanipi.pdf
    • https://s3.amazonaws.com/fasanag/wopokiv.pdf
    • https://s3.amazonaws.com/jamokaroxoj/70674212066.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_off000111f4.bin
823961d223dffc9f98b6906458c070a60fcc975f01d8064942b7bb1a210308ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x111F4 5596 bytes
font_01_sfnt_off00012520.bin
652aa5a4a60eb7750425f6e9bd541a90026274deaea699de4695ebb087e9a8ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x12520 11240 bytes