Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a57b9d094443cd…

MALICIOUS

PDF

70.4 KB Created: 2020-12-23 03:43:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b5a1a480434721ea91322979fe006d2 SHA-1: 5413f2b4ae687dfa418dd5c6601b948098123152 SHA-256: 90a57b9d094443cdcded2f0379015f9bccb44bdf3bdba3da9b0506400deab0bd
214 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics, including a critical finding of a link to known malicious redirector infrastructure and a PDF link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest a phishing or scam attempt, likely distributing further malicious content or leading to credential harvesting.

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://traffmen.ru/strik?utm_term=extreme+coupon+finder
    • https://cdn-cms.f-static.net/uploads/4485943/normal_5fab82362470d.pdf
    • https://cdn-cms.f-static.net/uploads/4416125/normal_5fae44fec1796.pdf
    • https://cdn-cms.f-static.net/uploads/4410002/normal_5fdbb8d63a4fa.pdf
    • https://cdn-cms.f-static.net/uploads/4380531/normal_5fa7d01f8fb87.pdf
    • https://mipigonegomef.weebly.com/uploads/1/3/0/8/130813466/nurubamosifatet_sowovonemin_ridek_xewujoroto.pdf
    • https://static.s123-cdn-static.com/uploads/4491945/normal_5fca9e6b1ae47.pdf
    • https://vabomunebalobi.weebly.com/uploads/1/3/1/8/131856010/19a955db5d768.pdf
    • https://cdn-cms.f-static.net/uploads/4366306/normal_5f8891a3306a8.pdf
    • https://pebabole.weebly.com/uploads/1/3/4/6/134698512/c688198b01.pdf
    • https://cdn-cms.f-static.net/uploads/4452381/normal_5faee74168a11.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gopuze/c_a_f_admit_card.pdf
    • https://s3.amazonaws.com/tadovu/agrippa_books_of_occult_philosophy.pdf
    • https://s3.amazonaws.com/begijufadi/bronkopneumonia_pada_dewasa.pdf
    • https://s3.amazonaws.com/fejififimaketo/25136897288.pdf
    • https://s3.amazonaws.com/fulosobezur/88053800068.pdf
    • https://s3.amazonaws.com/zamuriza/roganexatefimofo.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_off0000d87c.bin
77a74aa8e05cca52dd067e0c2eb874ebdd09af814c93b999c3f64a95fff1e1cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD87C 4904 bytes
font_01_sfnt_off0000e91f.bin
c346f07f83f052f41a8bd899b9c90b3cdd0908aef8a9b72e68c08734d4d5e32c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE91F 10580 bytes

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