Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e61beaf388b728…

MALICIOUS

PDF

40.0 KB Created: 2021-05-20 21:12:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 5b6024ff8fb74447063814f5c091761e SHA-1: 59f77326832473aa1b1beb0e3cc1da0950ab37af SHA-256: 87e61beaf388b728bf245e5af94ab27d0e85f514daac1cd6a93705b593276def
182 Risk Score

Malware Insights

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

The PDF document contains a lure for game hacks and presents a fake CAPTCHA, aiming to trick users into clicking malicious links. It explicitly requests recovery secrets or private keys, indicating a phishing or credential theft attempt. The embedded URLs point to sites offering game cheats, further supporting the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8060

Heuristics 6

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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-prison-life-hack-game-hack PDF link annotation
    • http://apkmaykop.ru/images/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • http://apkmaykop.ru/images/roblox-hacks-and-cheats_GM431946152.pdfIn PDF document text
    • http://apkmaykop.ru/images/coin-master-link-today_GM406889139.pdfIn PDF document text
    • http://apkmaykop.ru/images/free-spin-app-coin-master_GM406889139.pdfIn PDF document text
    • http://apkmaykop.ru/images/roblox-free-play_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003341.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3341 27692 bytes
SHA-256: 6a24b841389f5ab66ee17125b6c57dba5df6f977b28a5b2f996976c0b1529a0a
font_01_sfnt_off0000707a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x707A 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00007a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A64 18456 bytes
SHA-256: 407d6fb8d9efb45a2b1cddcfd151d3a069902e857cdd2d484da7c19786549282

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