Malicious PDF — malware analysis report

Static analysis result for SHA-256 779c5f008da55ea9…

MALICIOUS

PDF

71.3 KB Created: 2020-11-23 21:50:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b4a6901d14d6d3d1ca54ba19d85f3c1 SHA-1: d30f9195440192e4b27aa25064f169584ee2205f SHA-256: 779c5f008da55ea9147c11cf78bfc083e85cfa4bafb40c68588493b2d29a0a8f
214 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The primary malicious URL identified is 'https://traffmen.ru/123?utm_term=yugioh+duel+links+mod+apk+4.7.0'. The document body, though heavily obfuscated, appears to be related to software downloads, likely a lure for phishing or malware distribution.

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://traffmen.ru/123?utm_term=yugioh+duel+links+mod+apk+4.7.0
    • https://cdn-cms.f-static.net/uploads/4392452/normal_5f93be74f29f9.pdf
    • https://sadibagisu.weebly.com/uploads/1/3/4/7/134758630/dujaxe.pdf
    • https://cdn-cms.f-static.net/uploads/4413117/normal_5f9585dd84146.pdf
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/duxujapif_jumepolifi_luzilarumezo_zomiduxevow.pdf
    • https://fixoxotogixas.weebly.com/uploads/1/3/4/3/134374926/gelototefiropa-foxodi.pdf
    • https://cdn-cms.f-static.net/uploads/4390095/normal_5f9000b1dff98.pdf
    • https://cdn-cms.f-static.net/uploads/4385613/normal_5f8d43ffe9a99.pdf
    • https://cdn-cms.f-static.net/uploads/4417145/normal_5f9fdc362996c.pdf
    • https://cdn-cms.f-static.net/uploads/4418570/normal_5fa978248ab06.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/9045203c-604c-48dd-aead-1b9ecfdeb324/tofapalawejineloxo.pdf
    • https://uploads.strikinglycdn.com/files/84f3bda9-037a-4446-b328-7c8c68cc5f21/tasojamajakenopodugexusoz.pdf
    • https://s3.amazonaws.com/ritoma/greatland_outdoors_screened_tent_instructions.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc70.bin
693f0059c404bebb8937d11cab28274d06c3eb9a27df38b2f9b721a1bd7f031f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC70 5444 bytes
font_01_sfnt_off0000dec6.bin
dc8988112e316b6cbe2cf8218da8076f58271f55c862278bf1c2fa21ab99eac7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC6 10396 bytes
font_02_sfnt_off0001023f.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1023F 4324 bytes

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