Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f0c633d1914ef12…

MALICIOUS

PDF

74.5 KB Created: 2020-12-28 01:50:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: dfa7265a461de295cc93cb995adf320c SHA-1: bb1195e533cddabf5bbf62f69a1d86c75b2cb1aa SHA-256: 8f0c633d1914ef12053e9c5c148b2a940a33763b3c94abedf3a8f2687e6622fe
214 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a redirector link and a link farm. The embedded URLs, particularly 'https://traffine.ru/strik?utm_term=langrisser+mobile+character+ranking', are associated with malicious redirector infrastructure. The document's structure and content suggest an attempt to distribute malicious links under the guise of legitimate documents, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • 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://traffine.ru/strik?utm_term=langrisser+mobile+character+ranking In PDF document text
    • https://rigafefabapamum.weebly.com/uploads/1/3/4/4/134486683/45f275277.pdfIn PDF document text
    • https://cdn.sqhk.co/zotipimesaza/dih9gdg/tropical_forest_match_3_story_cheats.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/12593fc0-04ff-4689-b60b-d93bf37cb5a3/21020726538.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f01d97e3-1705-4331-8eac-af3840f77ac9/katetoselomovebo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d51c399a-7340-4e31-9455-b8c4bf40048d/taxi_sim_2020_game_download_uptodown.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/954abf00-b7eb-4ddf-a23a-6c4b9a5babf6/sleep_recovery_supplement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4ef8813-6133-4cae-a529-9e7984ee22ea/5th_edition_druid_wild_shape_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8026b709-e2c3-44a6-8c29-73d20dd48182/24261141732.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a44eeb15-c90e-47b3-a3ad-078293f8becd/16293422312.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16a333df-4dca-408c-a6e2-8b3a99917836/anatomy_and_physiology_coloring_book_chapter_4_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c268745d-a566-43c1-8164-0935d056feaf/bevupigemiweganajudigig.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FC 5360 bytes
SHA-256: aa01b3d220706ebeae929de002a289f147fe1e984c4e66363d2370e0977e2e7d
font_01_sfnt_off0000fc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0C 9684 bytes
SHA-256: f04babd3e71f4002644e6df2a4b6d82b05c05a3bc7517e49a4f9d929dca0c9ec

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