Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4816c8782d4493c…

MALICIOUS

PDF

45.8 KB Created: 2021-06-03 21:58:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: db255d1f164d83767b7a8bb41f87ad28 SHA-1: 7ca73b263e4307d3b94f067f95e59e4bd03ad47d SHA-256: b4816c8782d4493cfc6c78ff171d5856e51d95b40935ed24065a1cb6d1ca7ec5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to a website offering a 'game hack'. The heuristic firings indicate that these links point to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to the malicious URL, reinforcing the lure. No scripts were extracted, but the primary attack pattern involves social engineering via a fake generator to redirect users to a potentially malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.online/app/406889139/hack-coin-master-for-iphone-game-hack In PDF document text
    • http://perpus.masda.ac.id//repository/pubg-uc-zip-file_GM1330123889.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-robux-website_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/free-robux-picture_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/mcpe-master-free-coins_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-free-shield_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/new-free-money-links-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-coin-master-stuff_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-spins-coin-master-no-verification_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/roblox-heroes-online_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/minecraft-free-download-mac-full-version_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-hack-cheat-generator-d_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-coin-master-spin-generator_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/como-hackear-juego-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/robloxfun-com-robux_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/how-to-install-minecraft-for-free-on-ios_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-make-a-modded-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/minecraft-games-free-download_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_004_off00004ed6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4ED6 29876 bytes
SHA-256: be536abd272989af993ae50ee91dba9fe19249402d4fcf774805cb58cf01f71f
font_01_sfnt_off000090d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90D9 18220 bytes
SHA-256: a643bdf6fb2c46f92d7d27c645ae746f9817b2095321c6eed50ee62637779c53

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