Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7bb8d1a3276c60b…

MALICIOUS

PDF

250.2 KB Created: 2021-07-08 00:31:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 45e099eba3ce267c3ef0b5f308d966d2 SHA-1: 9e44233241dddcbea2964ffe194b7d01fa70b5a4 SHA-256: b7bb8d1a3276c60b3ba620d612767899d47494d227205186573a3567c088cb7d
218 Risk Score

Malware Insights

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

The PDF document employs a combination of lures, including a fake CAPTCHA and urgency, to trick users into clicking a malicious link. The link, disguised as a 'game hack generator', points to known malicious redirector infrastructure. This suggests an attempt to harvest credentials or deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier clean score 0.0098

Heuristics 7

  • 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
  • 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-top-up-center-game-hack In PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-spin-today-coin-master_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/twitter-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/huskybuscom-free-robux_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/roblox-gift-card-online-free_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-free-spins-link-whatsapp-group_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/esp-aimbot-wall-hacks-roblox-first-person-shooter-gui_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/tiktok-free-ebooks_GM835599320.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/get-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/play-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/synapse-roblox-hack-2021-download_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-make-a-roblox-hack-injector_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/should-u-use-free-models-in-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/minecraft-windows-free_GM479516143.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_off00037b94.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37B94 25928 bytes
SHA-256: d0c5e9f21b1deb7577560ea50fe07675f48c151ee690b33814fcd9865f49fd80
font_01_sfnt_off0003b8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3B8A6 18548 bytes
SHA-256: 22daff70653f6c300b9650586c32da146f6b323e0492657299974f9ba48668df

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