Malicious PDF — malware analysis report

Static analysis result for SHA-256 391ec6ec7cea8950…

MALICIOUS

PDF

32.0 KB Created: 2021-07-19 00:24:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 019ad066afd722cb32873c168d7e7a40 SHA-1: 0f81efb178bb45a9d4512dfa19b4418cf32c268b SHA-256: 391ec6ec7cea89504b76a0b2ce6434b039e847c31c7f01140fc90bf897a40ff9
160 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically a lure for game hacks. The document body and embedded URLs reinforce this, pointing to a site designed to trick users into downloading potentially malicious content. While no scripts were directly extracted, the nature of the redirector suggests it likely leads to further malicious activity, such as downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9201

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://netcdn.tw/app/431946152/how-to-hack-someone-on-roblox-game-hack In PDF document text
    • https://www.hobbypcb.com/images/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://www.hobbypcb.com/images/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2471 23924 bytes
SHA-256: c67cdc8f90fefb32ab5b6f11b89407c97f7413f1cdb3a202bc6f69cab7711dca
font_01_sfnt_off000059c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59C1 18792 bytes
SHA-256: 9bec9b42a66a3fadd8300817ea8ed63094da1293d480634873ce68f71127e696

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