Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab1733bbca768430…

MALICIOUS

PDF

67.3 KB Created: 2020-12-29 23:30:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 600a5dcc9a0604324796e773d77ae65f SHA-1: 1d3fd62df7e88dde3d245da965009310463e4bf9 SHA-256: ab1733bbca768430b9c6efb1dbb70f85cce51e16287cc6b4c99723a7d4160963
214 Risk Score

Malware Insights

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

The PDF contains embedded links that lead to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body text, though heavily obfuscated, suggests a lure for a "Starfinder character operations manual pdf download free". The ML classifier and ClamAV detection further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://ggtraff.ru/123?utm_term=starfinder+character+operations+manual+pdf+download+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4414176/normal_5fbc2703b6349.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368962/normal_5fabdcf8cb7dc.pdfIn PDF document text
    • https://cdn.sqhk.co/kipezipilojo/ibUjfgd/94997663580.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473632/normal_5fb2da99e2943.pdfIn PDF document text
    • https://rubitolagaju.weebly.com/uploads/1/3/5/3/135330326/tebovidole.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387421/normal_5fa45f53e3162.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412592/normal_5f985115c12b5.pdfIn PDF document text
    • https://cdn.sqhk.co/ravawiku/6VvWmgi/cisco_webex_meetings_scheduler_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/bebetirifam/jizhiA9/jagolavevupip.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/7BlNgiF/download_game_dev_tycoon_mod_money.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pegebunov/wiredukiz.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/clinicians_report_bulk_fill.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/b_tech_cse_syllabus_ptu.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/82588852658.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/itunes_user_guide_2018.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_off0000c7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CF 5588 bytes
SHA-256: c71800dce85649bf5fd145c79c66367223fd19595e0b67ef52e1b923419d0e28
font_01_sfnt_off0000dabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABB 10912 bytes
SHA-256: d21285b3374537a7a55ad0e81682a64704329e960dbbce80ba5edbd5a7279b4f

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