Malicious PDF — malware analysis report

Static analysis result for SHA-256 35ea53449e92f91c…

MALICIOUS

PDF

75.6 KB Created: 2020-11-23 12:41:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c17abe9c3002122d6e0f3ede8d43868 SHA-1: 1a86896d530fdfedc8c26b3e2cc6dbef587a085c SHA-256: 35ea53449e92f91ce6bbf3062a8a7a667f37db18dc0bc38d273642897da1663e
212 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one heuristic specifically identifying it as a malicious redirector and another as a link farm. The presence of these links, particularly to `traffmen.ru`, suggests an attempt to redirect users to malicious content or phishing sites. The ML classifier and ClamAV detection further support the malicious nature of the file, indicating it's likely used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9700

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.
  • 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
  • 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://traffmen.ru/aws?utm_term=bookworm+adventures+apk+mod
    • https://cdn-cms.f-static.net/uploads/4370263/normal_5fb2bfab84fbc.pdf
    • https://cdn-cms.f-static.net/uploads/4449783/normal_5fa240bd1a00e.pdf
    • https://cdn-cms.f-static.net/uploads/4480880/normal_5faec70404035.pdf
    • https://cdn-cms.f-static.net/uploads/4403119/normal_5f96f775428e7.pdf
    • https://pafovawulawagi.weebly.com/uploads/1/3/4/5/134581771/rimafezukimegagipo.pdf
    • https://cdn-cms.f-static.net/uploads/4366388/normal_5f89e56f6a2f6.pdf
    • https://cdn-cms.f-static.net/uploads/4368736/normal_5f87bfd57779a.pdf
    • https://xutativapejan.weebly.com/uploads/1/3/4/5/134521393/fatemi.pdf
    • https://cdn-cms.f-static.net/uploads/4393348/normal_5f9328d624910.pdf
    • https://nikirepe.weebly.com/uploads/1/3/4/7/134743809/3518190.pdf
    • https://tojuseviru.weebly.com/uploads/1/3/4/5/134513446/rusuvopitif.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xatojem/ashta_lakshmi_stotram_telugu.pdf
    • https://s3.amazonaws.com/gosete/artificer_leveling_guide_5e.pdf
    • https://s3.amazonaws.com/liwafo/42331846900.pdf
    • https://s3.amazonaws.com/vuxalirudidel/63548583524.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f573.bin
d4f2ffa31b5c1126563118adefbaea59e2a978d5c8c80961a654a427367de2d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF573 5336 bytes
font_01_sfnt_off000107a0.bin
78cb624e1252cd583f482c8a088b6e977f471eaa422936957d32996f28016c39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107A0 11536 bytes

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