Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae9f7efe07bd939e…

MALICIOUS

PDF

69.7 KB Created: 2020-12-30 13:44:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f62f57884f37aaf461b59f243dc3de8f SHA-1: cb87334c0fb0b5cf2680983d8d0e80554ba0c3db SHA-256: ae9f7efe07bd939e3ca248b2e37fe73ae46520ea9d7ac2007b2d173aafb41643
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to an external URL that is likely used to distribute malware or unwanted software. The embedded URL and the ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to downloading a game mod, aligning with the redirector's apparent purpose.

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-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://gettraff.ru/strik?utm_term=alto%2527+s+adventure+mod+apk+free+download
    • https://static.s123-cdn-static.com/uploads/4495385/normal_5febb179c9777.pdf
    • https://cdn-cms.f-static.net/uploads/4377662/normal_5fb768cb21b49.pdf
    • https://cdn-cms.f-static.net/uploads/4426413/normal_5fe69a8448a12.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kikunojulejuj/redetedegapinuderapiw.pdf
    • https://s3.amazonaws.com/libeganot/font_acme_gothic.pdf
    • https://s3.amazonaws.com/subud/75655064556.pdf
    • https://uploads.strikinglycdn.com/files/12d060cb-aec3-41c6-8d6f-53a5ff814a0b/modemazapatufiwajafigule.pdf
    • https://s3.amazonaws.com/vavapekadoliti/bt_answer_machine_number.pdf
    • https://uploads.strikinglycdn.com/files/68f6c560-ff46-4217-93d0-b5bc875a85e4/28434697290.pdf
    • https://uploads.strikinglycdn.com/files/2d1a5f40-8f1b-4609-b394-1fc7500c717a/7035199483.pdf
    • https://uploads.strikinglycdn.com/files/677d44cb-e909-4da0-b03a-453926923701/sosozuzavakanikofamutas.pdf
    • https://s3.amazonaws.com/dumupa/forming_up_a_concrete_sidewalk.pdf
    • https://uploads.strikinglycdn.com/files/c2e5daa4-de2d-466c-ac19-0f8078491152/dojozus.pdf
    • https://s3.amazonaws.com/telasebisu/watch_logan_full_movie_online.pdf
    • https://s3.amazonaws.com/xukonakefules/dlz_tv_on_the_radio_chords.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_off0000d338.bin
ee3c2a62dbfa8d4c27f30785ab2fe5742e811d7c35eece8787963c420b288c3b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD338 5428 bytes
font_01_sfnt_off0000e5b9.bin
5c567f37cbef496f2385e03ea5e259ffc2d6b03af7d415b7ca3b4f8f607ae107
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B9 10572 bytes