Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f75a49f7ff8cb12…

MALICIOUS

PDF

34.8 KB Created: 2021-06-19 13:48:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 931d39e307d323b2cf4cfa403ad26ef0 SHA-1: c9806871ea472fef9d5758b78055cb7405be4298 SHA-256: 0f75a49f7ff8cb1214fb65102778ae7363b6036dca87fefc219d82a21123ad7f
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.co/app/431946152/roblox-hack-executor-level-7-download-game-hack PDF link annotation
    • http://perpus.masda.ac.id/repository/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/check-cashed-cheat-engine-for-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/minecraft-xbox-one-edition-digital-code-free_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/how-to-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/how-do-you-get-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-free-spins-only_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/hack-the-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-get-free-robux-no-human-verification-pc_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/minecraft-gun-mod-download-free_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-gold-cards-hack-2021_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/how-to-get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/hack-coin-master-app_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/hack-sicript-free-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/hack-someone-on-roblox-and-steal-their-robux_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-spins-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-robux-without-any-verification_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_off00002f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F03 22436 bytes
SHA-256: 9439e9f848c83b5080b0b25ba72d81ded8a5d302ef5cb0759719b8dcfcaf9890
font_01_sfnt_off00006129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6129 19576 bytes
SHA-256: 77e89c9891d553738627a5d908bfcb74f0cd312b7b6dbf502b01ef161744bde7

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