Malicious PDF — malware analysis report

Static analysis result for SHA-256 48ce451b03c95164…

MALICIOUS

PDF

43.2 KB Created: 2021-05-22 13:42:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1b285ebbab5519a62c9cb1d9c2b2fcaf SHA-1: a6a24e7c7bc2fc806a5ee8ba6c11ca7249c89cd9 SHA-256: 48ce451b03c951648319bd822ae4c50ca2a04d47a51e5e282c9312a3c65ea16e
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains lures related to 'Free Robux Codes 2021' and a generator, directing users to external URLs. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent, likely to redirect users to a phishing site or a download for malicious software. No scripts were extracted, but the document body and heuristics strongly suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7429

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/free-robux-codes-2021-game-hack PDF link annotation
    • http://centr-expert.su/images/coin-master-hack-spins-apk-download_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/woman-roblox_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/roblox-hack_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/how-to-get-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://wolfzscriptsIn 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_off00002fb8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FB8 26016 bytes
SHA-256: 0c8fd56da4293ecc521479efb946d099a2ff0a4573898df2b55fcf4b1e25dcd0
font_01_sfnt_off00006b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B5B 8184 bytes
SHA-256: 5267349969336ffb76dd86a8b8b8900374687728d925be5be1ea414fa0de7d23
font_02_sfnt_off00008679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8679 18588 bytes
SHA-256: 0c0011b59677f21f59199ad7d2a82948105ed154610022cedcbab6f052c91d55

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