Malicious PDF — malware analysis report

Static analysis result for SHA-256 95535853d9d4cb3f…

MALICIOUS

PDF

33.0 KB Created: 2021-07-06 08:53:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3b15e4a67376b01c8819ee9abd12b506 SHA-1: 3a18d62d543ba7c068d1c800ae73281fcf680195 SHA-256: 95535853d9d4cb3f689b4dface121fa1f64695cd2621004afd42af4764ee0e4e
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/406889139/coin-master-hack-mobile-game-hack PDF link annotation
    • http://muslib.unmus.ac.id//repository/coin-master-free-spin-download_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/redeem-cards-for-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-promo-codes-2021-july_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-clothe-goku-free-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-free-attack-hack_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/minecraft-hack-ios_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-character-hack_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-cheat-enginge_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/hack-coin-master-ios-download_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/rbxoffer-com-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-minecraft-mods_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/como-sacar-buen-puntaje-en-juego-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/hack-coin-master-without-root_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-giveiaway_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-spins-on-coin-master-2021-ios_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-how-to-hack-robux-with-cheat-engine-64-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-free-robux-on-iphone_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_002_off00002c69.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2C69 22480 bytes
SHA-256: e431422d5dc686171cd199446fef4566ffc30e64aa8e9a68d97281e0f840ce79
font_01_sfnt_off00005e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E67 18236 bytes
SHA-256: 6a735436479ff0aab11f95a41c40e0b9404f26c9454ddfcce58982a18e600178

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