Malicious PDF — malware analysis report

Static analysis result for SHA-256 61e9e494ba0b833f…

MALICIOUS

PDF

69.1 KB Created: 2020-12-26 08:33:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af3489d72e4ea3814c15f005f83914ce SHA-1: d19fd13ce87ffccb5888828228aa1debe568fda0 SHA-256: 61e9e494ba0b833f50a2f3dea21fc2df8327efbb9f478b8b01e367295a1c74cc
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which are designed to appear as legitimate documents but redirect to malicious infrastructure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags the redirection to ggtraff.ru, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of this file.

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://ggtraff.ru/123?utm_term=natrona+county+jail+number
    • https://cdn-cms.f-static.net/uploads/4365551/normal_5fafe73b74efe.pdf
    • https://cdn-cms.f-static.net/uploads/4369781/normal_5fd84c00d8e4b.pdf
    • https://cdn-cms.f-static.net/uploads/4373271/normal_5f8983a1096a6.pdf
    • https://cdn-cms.f-static.net/uploads/4390641/normal_5fd7cf9321caf.pdf
    • https://cdn-cms.f-static.net/uploads/4405190/normal_5fa498f96e73e.pdf
    • https://cdn-cms.f-static.net/uploads/4454180/normal_5fb4a6ea9130a.pdf
    • https://cdn-cms.f-static.net/uploads/4387562/normal_5fb598bb9a66d.pdf
    • https://kivuligob.weebly.com/uploads/1/3/0/8/130874143/8451097.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xufujofaleki/avion_flight_simulator_2017_mod_apk.pdf
    • https://s3.amazonaws.com/novipaliwid/suddenlink_channel_guide_kingwood_tx.pdf
    • https://s3.amazonaws.com/buponuwebi/lusif.pdf
    • https://uploads.strikinglycdn.com/files/c74cb6f5-e877-4bee-b3f7-823d12274001/marenijusomeg.pdf
    • https://s3.amazonaws.com/jivagajamav/35328697318.pdf
    • https://s3.amazonaws.com/wozoxub/bholi_si_surat_dj_mix_song.pdf
    • https://s3.amazonaws.com/wunupalezozerud/11102597849.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_off0000d0a3.bin
064a931f1a5d248c5dba204d20fc247268438c979731f948a50cf4b1e2c99cae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A3 5056 bytes
font_01_sfnt_off0000e1d4.bin
ac855f6a1728fd624a06f33ef347beef0636211fa5bf6ab18849fb97c6dac56f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D4 10944 bytes

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