Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b7ca6f40613120…

MALICIOUS

PDF

34.2 KB Created: 2021-06-19 08:38:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 81b11bc0a1a9127f814347098587cf78 SHA-1: d4b22915ba8fad8e6457b99fadd7af8c9f89d081 SHA-256: c8b7ca6f4061312049d803d3dee4252ce32b26447aca86b03d442f9982cdc547
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links disguised as game hacks and free currency generators, a common lure for phishing or malware distribution. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, and the 'PDF_GAME_HACK_REDIRECT_LURE' specifically points to this deceptive tactic. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/how-to-hack-a-roblox-profile-youtube-game-hack PDF link annotation
    • http://library.feb.unila.ac.id/rfeb//repository/coin-master-hacks-to-get-spins_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/master-coin-hack-mod_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/coin-master-hack-tool-india_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/coin-master-free-spins-link-today-instagram_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/free-robux-hack-uk_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/minecraft-java-free_GM479516143.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/how-to-get-obc-for-free-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/free-robux-exe_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/free-robux-accounts-2021_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/coin-master-spin-hack-apk_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/robux-hack-tool-android_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/robux-fun-hack_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/coin-master-free-download-pc_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/clean-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/free-coin-master-spins-no-human-verification_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
font_00_sfnt_off00002d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D9C 22360 bytes
SHA-256: b85162014d74788f49e95deb55adf3c835d3fdc2d4213b4fff7ff72131c8900f
font_01_sfnt_off00005f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F31 19500 bytes
SHA-256: 9fa36749fd181a6fa75a1d1216d48b749cbdd75c41a859996b2ba64c07388de8

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