Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3680623a4ee24da…

MALICIOUS

PDF

251.8 KB Created: 2021-07-08 23:05:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0e8c61bc2c593cfc6905ec44c30fb9a9 SHA-1: e3d0c49605a891e9ca9b3c386ab6d88fee868dee SHA-256: b3680623a4ee24da578791e74d5e3f7a1bb799aa76d4e83dd33327e86e2b852e
258 Risk Score

Malware Insights

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

The PDF document contains multiple links to malicious redirectors, masquerading as game hacks and generators. It presents a fake CAPTCHA and an MFA lure, suggesting an attempt to harvest user credentials or abuse multi-factor authentication. The primary URL observed is http://netcdn.tw/app/1330123889/how-to-get-free-pubg-uc-without-human-verification-game-hack, which is associated with known malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier clean score 0.0098

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/how-to-get-free-pubg-uc-without-human-verification-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/how-to-get-free-pubg-uc-without-human-verification-game-hack In PDF document text
    • http://cintabaca.org/katalog/repository/coinmaster-blogspot_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/freegames911com-coinmastertipsandcheats2021freecoinsandspins_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-robux-mobile_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/free-robux-site_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/master-coin-hack-apk_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-robux-roblox-account-generator_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/wizard-hacks_GM479516143.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roblox-hack-free-no-verification_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/40-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-get-free-item-on-roblox-2021-and-2021_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roblox-shower-simulator-free-vip_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roblox-trolling_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roblox-free-view-camera_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-robux-no-survey-no-download-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/coin-master-game-free-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_off00037eda.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37EDA 26180 bytes
SHA-256: a9a0be9b34480a6e9cf8821f56929d43856b4c96d4e9e444143b096d839d6760
font_01_sfnt_off0003bc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3BC30 19580 bytes
SHA-256: 7d2f5f247c15c818ec10ff2fd6164523df9269d7483c41cd967540ee3a3ea303

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