Malicious PDF — malware analysis report

Static analysis result for SHA-256 afaf99e151b34fd2…

MALICIOUS

PDF

31.7 KB Created: 2021-07-19 02:48:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: cf909904339118d232ff2aca77494063 SHA-1: 099beb34f6f01e6e9cdbd431403fec240aa2915d SHA-256: afaf99e151b34fd295197f7ce5494e6ed755e2f27ea133f6a4a688c072ccf8d8
180 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors, specifically advertising 'free Robux' or game hacks. The document body and heuristics indicate a lure to download or access a generator, likely leading to malware execution. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/free-robux-exe-game-hack In PDF document text
    • http://interokna-kuban.ru/images/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://interokna-kuban.ru/images/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://interokna-kuban.ru/images/free-tiktok-views-no-verification_GM835599320.pdfIn PDF document text
    • http://interokna-kuban.ru/images/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://interokna-kuban.ru/images/minecraft-for-ipad-free_GM479516143.pdfIn PDF document text
    • http://interokna-kuban.ru/images/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • http://interokna-kuban.ru/images/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://interokna-kuban.ru/images/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://interokna-kuban.ru/images/how-to-create-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://interokna-kuban.ru/images/free-robux-hack-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_off00002a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A7E 21676 bytes
SHA-256: 16042a77615d0779156e7ede6d32c22a75ac5509b3400fcfe37307ab40582b24
font_01_sfnt_off00005a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A02 18200 bytes
SHA-256: 67527198e8f3e954f788e220fdc5e0efc04c24ca5928f64c044788dd6707c9fd

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