Malicious PDF — malware analysis report

Static analysis result for SHA-256 b131cff1711b826a…

MALICIOUS

PDF

39.5 KB Created: 2021-05-23 11:09:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 647fc85bdb8959d186ff13c4205acf7b SHA-1: 2ba6aed32e244dc582390eb22a00b5bbb250ee11 SHA-256: b131cff1711b826a159a0a70566ead07ca2faf08f566e49d832efe2710832c94
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains lures related to 'Free Robux Offers' and 'Roblox Generator', directing users to a suspicious URL. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful websites. No scripts were extracted, but the document body and heuristics strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8060

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-offers-game-hack PDF link annotation
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/tower-of-hell-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/minecraft-xbox-free_GM479516143.pdfIn PDF document text
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/coin-master-free-spins-hack-download_GM406889139.pdfIn PDF document text
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/master-free-spin-and-coin-link_GM406889139.pdfIn PDF document text
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/roblox-comroblox_GM431946152.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_off000032a8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32A8 25120 bytes
SHA-256: f19efb9d3292ce0d7e0aa9a3d0f843910dde292cbc6940feeb189f6ae1e37e2c
font_01_sfnt_off00006caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CAA 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off000079bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79BB 18012 bytes
SHA-256: 2fb616bca13af88ff89276a9b2d2fcc075dc4ebb9507e4cf45ab0719cef726f6

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