Malicious PDF — malware analysis report

Static analysis result for SHA-256 5885409e83fe852e…

MALICIOUS

PDF

35.2 KB Created: 2021-07-03 21:27:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: a0a2b1c9ca5eaf8dc0896aa8797a54a2 SHA-1: af4b9ec5804ce9ab6f176a841595f5be3921b586 SHA-256: 5885409e83fe852e506d8a186244f9c918606d002ec7375952959e05f4979693
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generator / game hack' lures. The document body and embedded URLs strongly suggest a phishing or scam attempt to trick users into visiting potentially harmful sites. No scripts were extracted, but the primary attack vector is the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/406889139/coin-master-free-spins-link-2021-no-verification-game-hack In PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-get-free-robux-on-computer-no-inspect_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/roblox-jailbreak-hack-mod-menu_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/minecraft-hacks-ps4_GM479516143.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-hack-no-verify_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/cheating-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/shark-bite-hack-roblox_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-get-free-robux-with-editthiscookie_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/master-game_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/roblox-hack-other-players_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-spin-today-coin-master_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-daily-free-spins-link-today-2021-free_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/comoser-hacker-en-roblox_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_off0000325d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x325D 22620 bytes
SHA-256: bc5f7dfd9ad3cf4f5b3e4a05b862a3c09c16cabac24693a33a03aca29fe010ec
font_01_sfnt_off00006516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6516 18880 bytes
SHA-256: c266cb11b6f3c1d665138e715d4086731d067edbcd7dae17a9f258cbfd36e0a5

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