Malicious PDF — malware analysis report

Static analysis result for SHA-256 34bdda598a59ab4a…

MALICIOUS

PDF

250.3 KB Created: 2021-07-05 23:19:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: f616f2c4d99e5e203baf618e646dcacc SHA-1: e4ba073b1003e46f210995407e189aade3996038 SHA-256: 34bdda598a59ab4aa12c0394e11c9c28d067e4bed553fbf83f0a6a9cdb4459f3
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1555.003 Credentials from Password Stores

The PDF file contains a high-confidence heuristic indicating it's a lure for game hacks, specifically linking to 'pubg-2021-uc-game-hack'. This link redirects to a domain associated with fake CAPTCHA and MFA verification prompts, strongly suggesting a credential phishing attempt. The document body, though heavily obfuscated, contains references to the malicious URL, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier clean score 0.0098

Heuristics 8

  • 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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: http://netcdn.tw/app/1330123889/pubg-2021-uc-game-hack.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://netcdn.tw/app/1330123889/pubg-2021-uc-game-hack PDF link annotation
    • http://lib.stimykpn.ac.id/repository/free-roblox-atamations_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/trustworthy-free-roblox-cheat_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/hack-mm2-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-make-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/100-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/robux-free-com_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-game-hack-online_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-use-cheat-engine-on-roblox-swordburst-2_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-weapons-for-free_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-do-you-get-free-roblox-clothes_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/epic-mining-hack-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/pixies-gigantic-coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/robux-free-url_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-roblox-credit_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/legit-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-and-spin_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_024_off00037c0a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37C0A 25928 bytes
SHA-256: df10962540c073e3acd9ea85de34725996d3dba9bfa0ba142b587649f1c7738b
font_01_sfnt_off0003b922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3B922 18528 bytes
SHA-256: 108f7f91e3381e60498cf62ce6e38da142bce0abb2e70076698a73d5e1ed949d

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