Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2cf6d873131a6a0…

MALICIOUS

PDF

74.5 KB Created: 2020-12-28 16:24:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8c992aebec67872ad9314c9f8258058 SHA-1: d359bd760ed7d9f2bd18c9cf1028e591a42e530f SHA-256: a2cf6d873131a6a077d085073f870cbdd98758d0259983b8eae8e3260d019689
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 a URL that is likely part of a phishing or malware distribution campaign. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to 'slot games for pc offline', suggesting a lure to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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
  • 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/strik?utm_term=slot+games+for+pc+offline
    • https://cdn-cms.f-static.net/uploads/4402294/normal_5fb51372557ee.pdf
    • https://cdn.sqhk.co/dojatejij/e7Ciajd/class_10_maths_exemplar_solutions_chapter_2.pdf
    • https://cdn-cms.f-static.net/uploads/4412758/normal_5fa8297179e10.pdf
    • https://nigikejogu.weebly.com/uploads/1/3/4/9/134902550/8434505.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d8b62304-62f7-44d1-bba0-877df8f46b94/palomowewafadekalevizo.pdf
    • https://s3.amazonaws.com/fekazudabo/automatic_call_recorder_java_app.pdf
    • https://s3.amazonaws.com/titugome/danger_symbol_vector_free.pdf
    • https://s3.amazonaws.com/tumasun/veged.pdf
    • https://s3.amazonaws.com/midizaxopazeji/xazebis.pdf
    • https://s3.amazonaws.com/vufupu/office_timeline_template.pdf
    • https://s3.amazonaws.com/xutomoxu/soniforad.pdf
    • https://s3.amazonaws.com/megujobemegor/fido2_server_guidelines.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_off0000e602.bin
3e7ca2227ad1bd0de044bdbde59dba0f18ff3fae97f242196e99c9cf9e1917dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE602 5436 bytes
font_01_sfnt_off0000f873.bin
c147ff352ad2c5a7cce76eac90c2a4604f61a8037d91bead416a46a2a2087374		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF873 10816 bytes

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