Malicious PDF — malware analysis report

Static analysis result for SHA-256 53574d18d76d7fbf…

MALICIOUS

PDF

75.6 KB Created: 2020-12-27 14:48:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fc7f1510e03bda060fc5731fcc5742e SHA-1: 50c88e249e3441e627121f9f52ef03e57afbc682 SHA-256: 53574d18d76d7fbf6dd13113c3673499207122969324d1fe4b913833958341f5
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains numerous embedded links, many of which point to link farms and redirectors. One critical heuristic identified a link to known malicious redirector infrastructure at https://cctraff.ru/strik. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or distribute further malware. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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://cctraff.ru/strik?utm_term=best+free+shooter+games+on+steam+2020
    • https://cdn.sqhk.co/ludukuni/RAJjcrm/61427188745.pdf
    • https://serawododi.weebly.com/uploads/1/3/4/8/134885696/231776702.pdf
    • https://cdn.sqhk.co/xisiwuba/hcXhfOK/wink_emoji_pic.pdf
    • https://duzobiwaroliwu.weebly.com/uploads/1/3/2/6/132696147/dinifomojimogen-gonobovureboz-juwax.pdf
    • https://cdn.sqhk.co/zezoxomop/Vibhigg/ball_brawl_3d_mod_apk_unlimited_money.pdf
    • https://cdn.sqhk.co/narulaloro/IgeL9he/lutoj.pdf
    • https://cdn.sqhk.co/pujapipiwat/eJginhf/wagisaxapagifezod.pdf
    • https://cdn.sqhk.co/fojufifef/iajft5P/tamil_dubbed_romantic_movies_in_tamilrockers.pdf
    • https://jimigafekalese.weebly.com/uploads/1/3/1/4/131407537/6817238.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/276d9339-1410-4f2d-b1d7-d82f907416bb/tecnologia_2_eso_ejercicios_resuelto.pdf
    • https://uploads.strikinglycdn.com/files/9f17612c-342b-41fd-9bbd-7a67095afea8/9042013823.pdf
    • https://uploads.strikinglycdn.com/files/0bcc5085-5f59-4e40-90e2-3135780e2bb9/mental_illness_memes_tumblr.pdf
    • https://uploads.strikinglycdn.com/files/5ba0f9ab-7c78-4dc6-aea2-157749de02ee/luck_mp3_song_download_bestwap.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_off0000ea00.bin
01cfee21573e715925dd9b74c94e6032d7bfa018046a01a6bd5df61de672223b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA00 5472 bytes
font_01_sfnt_off0000fc79.bin
394f353b8a2dbad52794c6ea59e6588410cb7db4eb4dd6755cc62caaf799390b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC79 10848 bytes

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