Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfca65bf4d23f296…

MALICIOUS

PDF

34.9 KB Created: 2021-05-22 14:34:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 25b1151e0442832a1534b20f14619a5b SHA-1: 0ff8d63740469b78c9e6d3159ec7ff89332eb9b4 SHA-256: bfca65bf4d23f296e9995a5e856bc1e1d58022614fb8ed7e6bf3c5ed487e388d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to redirector infrastructure, specifically advertising "Coin Master Free Spins" and "game hacks". These links are designed to lead users to potentially malicious sites. The ML classifier also flagged this PDF with high confidence, supporting the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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 https://netcdn.xyz/app/406889139/coin-master-free-spins-blogspot-game-hack In PDF document text
    • http://bestwig.de/images/how-to-hack-coin-master-root_GM406889139.pdfIn PDF document text
    • http://bestwig.de/images/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://bestwig.de/images/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://bestwig.de/images/coin-master-daily-free-spins-link-app-download_GM406889139.pdfIn PDF document text
    • http://bestwig.de/images/free-roblox-pin-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
stream_002_off00002f8a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F8A 24016 bytes
SHA-256: f577c12af799f5937f3bdfdc700dd1a87cb9007670c0b333c350f2110efd68d5
font_01_sfnt_off0000668a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x668A 18464 bytes
SHA-256: 7f13c81e41627db5de1fdc011b77043c9877b216986226f08b9acd2eded814ce

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