Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d85c288bd34345…

MALICIOUS

PDF

34.0 KB Created: 2021-07-06 09:05:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 6899e69df29e4b463261797b52739766 SHA-1: 1a33c7cdb0719d2d56f2189b83b50765cf58f5d3 SHA-256: 91d85c288bd34345021b9cd4cd9a8e920aa936f7c5e6ace8ffe508f5fed1b1d9
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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/479516143/how-to-get-minecraft-for-free-on-tablet-game-hack PDF link annotation
    • http://library.asih-husada.ac.id/repository/free-roblox-users-with-robux_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/roblox-free-download-jaleco_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/app-to-earn-free-robux-for-downloadign-games_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/how-to-get-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/how-to-hack-roblox-with-cheat-engine-651_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/roblox-troll-players-inject-script-hack-pastebin_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/coin-master-free-spins--spins_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/roblox-vehicle-simulator-money-hack-2021_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/free-roblox-hack-script-executrer_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/can-i-hack-coin-master-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/roblox-jailbreak-hack-unjailbreak-script_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/coin-master-hack-fast_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/minecraft-realms-free_GM479516143.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/hacked-case-clicker-roblox_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/does-cheat-engine-execute-scripts-into-roblox_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/roblox-purple-shirt-free_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/roblox-hack-apk-android-2021_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_off0000305b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x305B 22304 bytes
SHA-256: 19eb3a87647a3343c3c7148d4782306f936f5421430de5ae3316274072d3c7ec
font_01_sfnt_off000061d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61D6 18396 bytes
SHA-256: ae0dec2f68f79dd0cedece771f57f6da4b37664bf1150be991697a6d8196cd05

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