Malicious PDF — malware analysis report

Static analysis result for SHA-256 83af21adcbcf526f…

MALICIOUS

PDF

33.3 KB Created: 2021-07-20 06:22:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: c85f830d81d9c61099b5f8ae70a62f70 SHA-1: f540946ecb0b4c3fdd2d4a3916b614717c5b4934 SHA-256: 83af21adcbcf526f00506ea2eaddabdcb737dc0871b5a4f5b0689e87855405f6
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, masquerading as "free generators" or "game hacks" to entice users. The primary lure URL is http://netcdn.tw/app/835599320/free-tiktok-followers-no-survey-game-hack. The document body also contains a call-to-action phrase, reinforcing the lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or social engineering attack aimed at redirecting users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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/835599320/free-tiktok-followers-no-survey-game-hack In PDF document text
    • http://genialica.com/images/tiktok-free-fans_GM835599320.pdfIn PDF document text
    • http://genialica.com/images/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • http://genialica.com/images/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://genialica.com/images/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • http://genialica.com/images/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://genialica.com/images/minecraft-pe-free-ios_GM479516143.pdfIn PDF document text
    • http://genialica.com/images/free-tiktok-fans-no-verification_GM835599320.pdfIn PDF document text
    • http://genialica.com/images/how-to-get-free-likes-on-tiktok_GM835599320.pdfIn PDF document text
    • http://genialica.com/images/minecraft-free-download-chromebook_GM479516143.pdfIn PDF document text
    • http://genialica.com/images/free-spins-on-coin-master-2021_GM406889139.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_off000030f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30F0 21744 bytes
SHA-256: 1ef09e1571ad99074f2da716af936d81d9ff9ab56e6f3d5bb2a9f85980b6a063
font_01_sfnt_off000060c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60C4 18128 bytes
SHA-256: 4d5ae90dc7158db100f8a60f18795856627c30e44bb6186b706c2f28ceb56c30

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