Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f7babd936c21fbe…

MALICIOUS

PDF

41.1 KB Created: 2021-05-22 15:12:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 69e4ff5ea31f3d7923ae3777705084f2 SHA-1: 8c5d20d6f1679bf563394aa844c0dc5c44d48b55 SHA-256: 8f7babd936c21fbef400adefea2ab05410d8dc1f7e18cedfccc10210251efe5e
82 Risk Score

Malware Insights

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

The PDF document uses a "free Robux generator" lure, a common theme for scams and malware distribution. It contains multiple links to external websites, including one that appears to be a redirector for game hacks. The presence of PDF-specific heuristics for URI redirection and game hack lures, combined with the ML classifier flagging it as malicious, strongly suggests a malicious intent to redirect users to potentially harmful content. No scripts were extracted, but the document body and embedded URLs indicate a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7445

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/431946152/how-do-u-get-free-robux-2021-game-hack PDF link annotation
    • http://hospitalsalamanca.cl/images/coin-master-gift-link-hack_GM406889139.pdfIn PDF document text
    • http://hospitalsalamanca.cl/images/www-coinmaster-com_GM406889139.pdfIn PDF document text
    • http://hospitalsalamanca.cl/images/free-coin-master-gold-cards_GM406889139.pdfIn PDF document text
    • http://hospitalsalamanca.cl/images/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://hospitalsalamanca.cl/images/coin-master-hack-org_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003439.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3439 25436 bytes
SHA-256: 30a499151787e8ba45cc6e22579a4260a8b3f35e261e94e784b52dfe38958b5e
font_01_sfnt_off00006f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F38 4092 bytes
SHA-256: aa00fe99854493578b1000ece8cd730a595b1d52338790ecce0308d5d0077d86
font_02_sfnt_off00007ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CA2 19040 bytes
SHA-256: 14ed63897d8c38c9b74f4ae6c685ddc963b8153977262fdb6411d06658c720a7

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