Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a5dd553e06299c…

MALICIOUS

PDF

49.3 KB Created: 2021-06-10 14:18:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 0fb31d7d3f26e46c3533ab59ffdccbb9 SHA-1: beae6679abe46af23172ef466fdf61ef68af5f28 SHA-256: c4a5dd553e06299c6291b04e8668e2e74823d19e368f946b7f6035a00baddbcd
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are disguised as game hacks or generators, indicating a phishing or scam attempt. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' specifically flags this behavior. The presence of multiple links suggests a link farm or SEO manipulation tactic to drive traffic to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9861

Heuristics 5

  • 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.
  • 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 https://netcdn.tw/app/431946152/goo-dot-gl-hnkqwp-replace-dot-with-free-robux-game-hack PDF link annotation
    • http://uilis.unsyiah.ac.id/ebook/repository/how-to-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/free-roblox-generator_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/free-unredeemed-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/coin-master-free-spin-download_GM406889139.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/hacks-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/wurst-115-2_GM479516143.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/comment-hacker-quelquun-dans-roblox-qui-a-bocou-de-rebux_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/free-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/coin-master-free-spins-and-coins-for-iphone_GM406889139.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/roblox-cheat-engine-forcefield_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/roblox-ps4-free_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/como-hackear-coin-master-sin-verificacion-humana_GM406889139.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/coin-master-collect-today-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_004_off00005644.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5644 28676 bytes
SHA-256: 3128579951e504646fd461308b36a8ee753059458c48af445e2f7e25784e96dc
font_01_sfnt_off00009a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A21 19752 bytes
SHA-256: 90c9a6cfb17da8ad80654966dbd3881add312ed935e9fa13fcb882f5d2c187fe

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