Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac299b458b42ac96…

MALICIOUS

PDF

32.6 KB Created: 2021-07-19 20:41:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 2c3ad299b3fc57347d7f80cd525f50ec SHA-1: aedad5f14a271bb7899238159b1230e179565c30 SHA-256: ac299b458b42ac967ad585386bb2c00f1f5ae71fe47f853ece2074b7c04e722c
160 Risk Score

Malware Insights

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

The PDF contains multiple links to redirectors and other PDFs, masquerading as game-related cheats or generators. The primary redirector URL, http://netcdn.tw/app/406889139/master-coin-free-spin-game-hack, is flagged as malicious. The document body also contains a "CLICK HERE TO ACCESS COIN MASTER GENERATOR" call to action, reinforcing the lure. While no scripts were directly extracted, the PDF structure and embedded links suggest a workflow designed to lead the user to potentially malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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/406889139/master-coin-free-spin-game-hack In PDF document text
    • http://msfs-eastafrica.com/images/minecraft-pc-free_GM479516143.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/free-minecraft-alts_GM479516143.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/free-robux-site_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/how-to-get-minecraft-pe-for-free_GM479516143.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/minecraft-games-free-download_GM479516143.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
stream_002_off000029c1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x29C1 23372 bytes
SHA-256: 374eaedf95548aa0d598e8e0314ba32cb80d1126deb7dec141e9205dec626a2d
font_01_sfnt_off00005e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E71 17884 bytes
SHA-256: 2eace5707960ab6674c345fc5925bb74d79b72c9d0e947ec779627780b9711cb

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