Malicious PDF — malware analysis report

Static analysis result for SHA-256 2162ee60248b6de8…

MALICIOUS

PDF

37.7 KB Created: 2021-05-23 18:08:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 9a2729a13d574f43b2c7e5bf11f01f7d SHA-1: 2de81306bbc27b972ce272becae40f27a4087a3d SHA-256: 2162ee60248b6de86f7b327f4af2fd9b5182264ffaa8031ebfee71b9c16af5cc
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a lure for free Robux, presenting a fake CAPTCHA to trick users into clicking a malicious link. The embedded link directs to a generator/hack site, which is a common social engineering tactic. While no scripts were explicitly extracted, the PDF structure and heuristics indicate it's designed to facilitate user interaction leading to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

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/431946152/how-to-get-free-robux-without-verification-game-hack PDF link annotation
    • http://bluediffusion.it/images/how-to-get-free-spins-on-coin-master-2021-iphone_GM406889139.pdfIn PDF document text
    • http://bluediffusion.it/images/how-to-get-free-likes-on-tiktok_GM835599320.pdfIn PDF document text
    • http://bluediffusion.it/images/free-tiktok-likes-app_GM835599320.pdfIn PDF document text
    • http://bluediffusion.it/images/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://bluediffusion.it/images/coinmaster-gps-user-review-coinmaster-coin-master-hack-pagedemo-index_GM406889139.pdfIn PDF document text
    • https://www.bandicam.comIn 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_off000032e2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32E2 26620 bytes
SHA-256: 336de37198b1d3752db05c9cb78fcc11a8ef7a29b076c14004b1aef45f40ecea
font_01_sfnt_off00006f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F67 19128 bytes
SHA-256: fe2fba94a2d86c9c71a87afecb14f9f9cb432365285dbf62d8027955010708b1

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