Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf70dd82afca636…

MALICIOUS

PDF

41.0 KB Created: 2021-05-22 07:10:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 7336d28c77535c5592ccdbcaad70c19d SHA-1: e84ea42fd249d125c6cea29bcf36a1ef1497e2a7 SHA-256: 5bf70dd82afca63663a173ee28486e332578c0f9fa126abf26164b0877b68e7c
122 Risk Score

Malware Insights

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

The PDF document contains a lure for a 'free generator / game hack' which redirects to a suspicious URL. It also displays a fake CAPTCHA to trick the user into interacting with the document, likely to trigger further malicious actions. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7445

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/479516143/minecraft-hack-mod-game-hack PDF link annotation
    • https://bdhcpa.com/images/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • https://bdhcpa.com/images/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • https://bdhcpa.com/images/minecraft-life-hacks_GM479516143.pdfIn PDF document text
    • https://bdhcpa.com/images/minecraft-pe-016-0-apk-download-free_GM479516143.pdfIn PDF document text
    • https://bdhcpa.com/images/roblox-dominus-free_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_off000035bf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x35BF 28592 bytes
SHA-256: c2e47a8503802baa2f95c60029c0b91873851c1314a77ee15033396a8dc80ac3
font_01_sfnt_off000075f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75F2 2820 bytes
SHA-256: 972979c3a46100cf5f8fd289bc6fbd2496ff75fec0e3f6753648c72ec6eba714
font_02_sfnt_off00007f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F91 18056 bytes
SHA-256: c98163390533840513273057c02ab8b0002c23ddfc36b9b9583c7d176bc18763

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