Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ef88aacebd32a2d…

MALICIOUS

PDF

34.9 KB Created: 2021-07-05 04:48:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 0662a54f826fd2e7eb92294410aea607 SHA-1: fe61db1c34fb8f6b49c07bb3611b5a83b3cc8ae7 SHA-256: 2ef88aacebd32a2dcbe1468cff440e4b16671223a308afa17283f0d0e101b126
142 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are disguised as game hacks or free item generators for popular games like Coin Master and Roblox. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these links, suggesting a primary purpose of SEO manipulation or directing users to potentially malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.tw/app/406889139/coin-master-20-free-spins-link-2021-game-hack PDF link annotation
    • http://lib.fisipumt.ac.id/repository/coin-master-free-spins-hack-2021_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/how-to-hack-coin-master-using-es-filer_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-without-human-verification-or-email_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roxploits-roblox-exploits-and-hacks_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/how-to-get-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/roblox-bloxburg-hack_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/minecraft-skins-download-free_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/moonactive-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-hack-mod-apk-35-8_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/when-does-roblox-librity-county-come-out-free_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-hack-roblox-with-cheat-engine-prison-life_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-bc-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-robux-com_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-ti-get-free-clothes-with-no-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/how-to-get-free-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-shield-hack_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-free-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-pet-simulator-cheats-mobile_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
font_00_sfnt_off00003191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3191 22680 bytes
SHA-256: 884a6e4e632e050fa95fa07a202718e5062e487ff60bec94b271359ed2a27dfb
font_01_sfnt_off00006424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6424 18748 bytes
SHA-256: 2fa519299f8a2165e5faef35be9d47acb7f717a213bb0fe22b3fbdc2136af6a5

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