Malicious PDF — malware analysis report

Static analysis result for SHA-256 a588f242b2caf924…

MALICIOUS

PDF

47.6 KB Created: 2021-06-11 09:54:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 224d861c4c4d9eb54ae92264f74ed707 SHA-1: 69e87b6baaef8e3dbec96f4438a3d7014bb2d4bc SHA-256: a588f242b2caf92494e13e02e8cce65bf174287a6720a6fe325093d068e5cb19
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links disguised as game hacks and generators, likely to redirect users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and the 'PDF_GAME_HACK_REDIRECT_LURE' specifically points to a lure for game-related cheats. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to exploit user interest in free in-game items to drive traffic to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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/free-pet-in-roblox-game-hack PDF link annotation
    • http://muslib.unmus.ac.id/repository/how-to-get-free-shields-on-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-free-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/minecraft-java-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/hack-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-roebucks-no-human-verification_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/anime-cross-roblox-hack_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-free-animatins_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-coins-and-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-5-million-robux-for-free_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-free-coins-amp_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-codes-noverber-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-daily-free-link_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/free-roblox-groups_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/roblox-g_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005178.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5178 26432 bytes
SHA-256: f885735d8c2d6c479ae11c91d6b060abfa2960b97fd8dae79c507dd4798cf5e0
font_01_sfnt_off00008dee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DEE 2852 bytes
SHA-256: e9630f3bb738ae3bc329a423cf069c8035d70ce2227e3557c42815f85ad3284f
font_02_sfnt_off000097af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97AF 18204 bytes
SHA-256: 4a93e0b835f847313e5835f13411c56231b57448a469ba761b4f25f40e45139a

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