Malicious PDF — malware analysis report

Static analysis result for SHA-256 426856e76aa138bc…

MALICIOUS

PDF

251.2 KB Created: 2021-07-05 16:14:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 538aa9b6cb77fa695ee1eac47c500925 SHA-1: cfcae514eff591862bccac88ea23b76bbc49502e SHA-256: 426856e76aa138bc835e4203a3bab8f525487b639fd05eaade66f5f0ce217698
258 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1534 Credentials from Password Store

This PDF document employs a fake CAPTCHA and brand impersonation lure, specifically targeting Facebook, to deceive users into clicking a malicious link. The link redirects to a known malicious infrastructure, likely to harvest credentials or distribute further malware. The presence of multiple redirector links and the MFA lure suggest a sophisticated phishing attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.0099

Heuristics 8

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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-uc-buy-ksa-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
  • 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-uc-buy-ksa-game-hack In PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-hack-xyz-download_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-no-download_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/roblox-cheat_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/minecraft-pe-hack-client-2021_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-free-spin-link-today-download_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-minecraft-account-generator_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/minecraft-pe-free-apk_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-spin-cheat_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/legit-coin-master-hack-october-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/before-dawn-hack-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-ios-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/hack-players-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-unlimited-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-hack-coin-master-apple_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-fire-coin-master_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_off00038062.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x38062 25928 bytes
SHA-256: 2ae3e2c00883af833cec8ad553b0b0b918ab14a926b95c36ef48e5710b94b90f
font_01_sfnt_off0003bd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3BD80 18308 bytes
SHA-256: ca4a074d279a9c163c7c7688ce021545c889d16eac13f2bc84a6838aea0c5e61

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