Malicious PDF — malware analysis report

Static analysis result for SHA-256 aded6dd8fc803fbd…

MALICIOUS

PDF

67.6 KB Created: 2020-12-03 21:53:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be970180c5aaa93f2081d4303e614c59 SHA-1: 91cfa164a41d4d2c0fbad4926b66d9635ff5a435 SHA-256: aded6dd8fc803fbde388759156d739441df31d0b5750c138b6246109ce9023b1
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, with at least one pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to downloads, suggesting a lure to entice users to click the malicious links.

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=downloads+naruto+episodes
    • https://cdn-cms.f-static.net/uploads/4487626/normal_5fa9ce5ce41c3.pdf
    • https://cdn-cms.f-static.net/uploads/4365638/normal_5f870077414a6.pdf
    • https://static.s123-cdn-static.com/uploads/4421478/normal_5fc426471133c.pdf
    • https://defutijobazaso.weebly.com/uploads/1/3/4/5/134587482/2157b4df533ae.pdf
    • https://nikokabiliru.weebly.com/uploads/1/3/1/4/131409463/wazumumekesodoxubiw.pdf
    • https://cdn-cms.f-static.net/uploads/4462345/normal_5faa7c3923ad6.pdf
    • https://cdn-cms.f-static.net/uploads/4403276/normal_5fb70dd6b9111.pdf
    • https://tezolujekile.weebly.com/uploads/1/3/4/4/134497819/bameputifu-wafafigiwib-bigezewo-bawivefej.pdf
    • https://durozuxazoxete.weebly.com/uploads/1/3/4/6/134647509/5355700.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/59af0d54-4d27-411b-ba1b-ab3c35835259/sumitugavata.pdf
    • https://uploads.strikinglycdn.com/files/e4229985-3c28-47f4-9512-74ff45873c10/titelup.pdf
    • https://s3.amazonaws.com/woxojuxafopuv/80958404325.pdf
    • https://s3.amazonaws.com/kavalukato/36015907983.pdf
    • https://uploads.strikinglycdn.com/files/386d3302-09f1-4ee2-962f-6b158c28a711/super_star_mario_kart.pdf
    • https://uploads.strikinglycdn.com/files/2752908d-430a-42e2-a170-c65e4b436f11/mafexenamenisuxof.pdf
    • https://uploads.strikinglycdn.com/files/992ecb98-30df-46e1-92bb-0880b6114934/17077303445.pdf
    • https://uploads.strikinglycdn.com/files/4b3d1234-f628-472a-96a2-5a95194227a4/68256784688.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_off0000cb28.bin
71689b8a89b15888c0cdee8e7252f94a8b3738d8dbfb71f99274360f7782cca4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB28 5044 bytes
font_01_sfnt_off0000dc75.bin
5c9dd20bd9b22062aceaa2df42d24e6e7739398fdd1f64519f14c80d058483d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC75 10832 bytes

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