Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b1022eb52e5002…

MALICIOUS

PDF

30.7 KB Created: 2021-07-19 10:31:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 68406a79f71923b3afd72110942ef6f5 SHA-1: 91ca18fd2599fc9aae95a19ac8adc4f98cb670c2 SHA-256: d1b1022eb52e50020dc34ec72590fc9450834715e9b813691d7b6ce76702c8a4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, with one specifically identified as a malicious redirector leading to a 'game hack' lure. The document body, though partially corrupted, also contains text related to obtaining free items and a call to action, reinforcing the phishing pretext. No scripts were extracted, but the presence of malicious redirector links and the lure suggest a phishing attempt to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9319

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/479516143/how-to-get-minecraft-for-free-on-chromebook-game-hack In PDF document text
    • https://www.pendaftarantransvision.com/ckfinder/userfiles/files/minecraft-pocket-edition-free_GM479516143.pdfIn PDF document text
    • https://www.pendaftarantransvision.com/ckfinder/userfiles/files/free-robux-com_GM431946152.pdfIn PDF document text
    • https://www.pendaftarantransvision.com/ckfinder/userfiles/files/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.pendaftarantransvision.com/ckfinder/userfiles/files/free-robux-roblox-promo-codes_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_off000023d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23D7 22328 bytes
SHA-256: 9621fc2f55acd304c289be1b36912defb4034a030d56cd880f5ec09894af1954
font_01_sfnt_off00005565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5565 18628 bytes
SHA-256: 3a4e3f8378819557dde5b27ff4793c702252829ac96e9550bc2b3bfa5905855e

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