Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b6d388ba530a2d…

MALICIOUS

PDF

45.1 KB Created: 2021-05-11 06:06:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f66707d14b82224035b303c28e089635 SHA-1: 21f9a46c90f657046a05ef903198b616932729cc SHA-256: f8b6d388ba530a2dae0787986d2c1eb6fe0a98bd8a5e3a3637aa7625a87b0383
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed as a link farm, with a primary URL pointing to a 'game hack' lure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a malicious intent to drive traffic to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9621

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.xyz/app/406889139/how-to-hack-golden-card-in-coin-master-game-hack PDF link annotation
    • http://perpus.stikesphi.ac.id/repository/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-free-spins-moonactive_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/how-to-get-free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/minecraft-free-download-ipad_GM479516143.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-free-coins-cheat_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-hack-uk_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/how-do-i-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-rewards-2021_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-links-for-free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-hack-apk-no-fb-login_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-free-coins-and-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/minecraft-pe-016-0-apk-download-free_GM479516143.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_003_off000049da.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49DA 24684 bytes
SHA-256: 7ce2d7956be1be7a1fa1dcc6370af5e0a274d2cf056059e9e5b282fddca74da8
font_01_sfnt_off0000813d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x813D 3620 bytes
SHA-256: a7ffd47631dfdffd19913a7d019e14a4e4f6584a4e894343a0be0687632311e4
font_02_sfnt_off00008e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E00 18128 bytes
SHA-256: 6e99c01af804bf31f20ebf44881e4bc5fba6244af653fbf7f93a50858f61393b

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