Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3af58729365e44c…

MALICIOUS

PDF

252.0 KB Created: 2021-07-06 10:15:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 6fc28cd7d0958ebf950bafd27a01b5ec SHA-1: 7ace74ae1725d10d7e093aa1077cf9c6819ab21d SHA-256: a3af58729365e44ce6e3191e61d4f92ac67323f3487cec9960fa5539cdd0a1ac
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link T1534 Credentials from Password Stores

The PDF file contains a high-confidence heuristic indicating it impersonates the brand 'Apple' and uses a fake CAPTCHA lure to trick users into clicking a malicious link. The linked URL, http://netcdn.tw/app/1330123889/where-to-buy-pubg-uc-game-hack, is associated with game hacks and redirects, suggesting a credential harvesting or scam attempt. The document body, though heavily obfuscated, contains references to the same URL and game-related terms.

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/where-to-buy-pubg-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/where-to-buy-pubg-uc-game-hack PDF link annotation
    • http://library.unissula.ac.id/fk//repository/free-spins-coin-master-april-2021_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/coin-master-daily-free-spins-link-haktuts_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/minecraft-bedrock-free-download-pc_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/coin-master-on-facebook_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/roblox-free-robux-april-may-2021_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/free-cruch-skin-for-roblox_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/free-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/coin-master-hack-no-download_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/coin-master-hack-dot-xyz_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/how-to-get-minecraft-bedrock-edition-for-free_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/daily-free-coin-and-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/coin-master-hack-xyz-2021_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/roblox-anime-cross-2-hack-money_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/how-to-give-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-links-that-don-t-expire_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/robux-hack-no-verification_GM431946152.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_off00038251.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x38251 25960 bytes
SHA-256: 340f4cdf9ac841a87983bf2730a946b6d41efc8d1864a99185d423f8622c43d5
font_01_sfnt_off0003bf65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3BF65 18812 bytes
SHA-256: b6b750af6bc97299e95772a2f485b19c2a3fd524972f1b68f43d3105c162f2ea

Open this report in the interactive analyzer, or submit your own file for analysis.