Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c9d082ad8682d1…

MALICIOUS

PDF

71.7 KB Created: 2021-01-08 10:04:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9d3b6bfd464f4ea5172b07ee8f3449f3 SHA-1: 229eee24e8f567efc15b2cac486da62ea3b8f403 SHA-256: a3c9d082ad8682d122679383aa0871113c2e8dc001ffd3a9ffe19f93599167cf
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://gettraff.ru/aws?utm_term=practice+telling+time+clock+worksheets'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, suggests a lure related to 'practice telling time clock worksheets', which is likely a pretext to disguise the malicious link. No scripts were extracted, but the presence of a malicious URL is a high-confidence indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/aws?utm_term=practice+telling+time+clock+worksheets In PDF document text
    • https://static.s123-cdn-static.com/uploads/4450244/normal_5ff2268832d69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403141/normal_5f9c5106a22fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460682/normal_5fc1eed0aeeaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367289/normal_5f9b82b8d252b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374542/normal_5f972dbcabb99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373008/normal_5f8d0436f1477.pdfIn PDF document text
    • https://cdn.sqhk.co/jagavibejabe/haGidjb/warriors_game_ps2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403565/normal_5fae2f0495495.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/0d72e15d-c093-4924-b118-c513a26c97c2/best_survival_axe_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/611b9bd9-4a0f-459c-94a8-83f361542a9e/15634617044.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/radio_button_border_color_android.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/badopowozonodet.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE5 5160 bytes
SHA-256: f69c8b45ab48da4e46ac2313892005c4b939d17de84585447e627b3d60481c3a
font_01_sfnt_off0000df47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF47 10560 bytes
SHA-256: e603c922b2514e9b3b49765d2f56d5c2dac22edf1667b13df7e3e3f5deebdda4
font_02_sfnt_off00010387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10387 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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