Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2feacf5365cc3f2…

MALICIOUS

PDF

41.7 KB Created: 2021-05-19 00:07:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 975780df8bd22afae6eeebfc7478bd1f SHA-1: 18b88063a78b9a4c0cfc0b31aa002e285481f434 SHA-256: a2feacf5365cc3f26432ea501d8d2cc6c7684a4670f7ba2f04c96ce7c856a706
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/roblox-robux-generator-tool-game-hack PDF link annotation
    • http://uptodate.az/images/coin-master-daily-free-rewards_GM406889139.pdfIn PDF document text
    • http://uptodate.az/images/coin-master-hack-no-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://uptodate.az/images/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://uptodate.az/images/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://uptodate.az/images/coin-master-free-spin-game_GM406889139.pdfIn PDF document text
    • http://uptodate.az/images/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • http://uptodate.az/images/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://uptodate.az/images/hack-the-coin-master_GM406889139.pdfIn PDF document text
    • http://uptodate.az/images/rbx-roblox_GM431946152.pdfIn PDF document text
    • http://uptodate.az/images/best-free-spin-app-for-coin-master_GM406889139.pdfIn PDF document text
    • http://uptodate.az/images/coin-master-free-spins-2021-hack_GM406889139.pdfIn PDF document text
    • http://uptodate.az/images/how-do-u-hack-roblox_GM431946152.pdfIn PDF document text
    • http://uptodate.az/images/roblox-free-login_GM431946152.pdfIn PDF document text
    • http://uptodate.az/images/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://uptodate.az/images/robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://uptodate.az/images/free-bling-bling-card-coin-master_GM406889139.pdfIn PDF document text
    • http://uptodate.az/images/robloxfun-com-generator_GM431946152.pdfIn PDF document text
    • http://uptodate.az/images/free-minecraft-server-hosting-24-7_GM479516143.pdfIn PDF document text
    • http://uptodate.az/images/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://uptodate.az/images/coin-master-daily-spin-free_GM406889139.pdfIn 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_003_off0000464f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x464F 25164 bytes
SHA-256: 7f75bacfe202013f53d77ea5a0ec794d3bed3158e8fb40b7e637593cceac1f61
font_01_sfnt_off00008049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8049 18256 bytes
SHA-256: d3f4191cb905e11e15b1a275d00a7cd931df57561d027c5bc59f2434de0157e6

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