Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f6243634a48426…

MALICIOUS

PDF

35.6 KB Created: 2021-07-05 14:45:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c7afd1608f9a29ab31c2cde9bc4f3a31 SHA-1: 3331514e05c33056b328359f93326ae31b845ac3 SHA-256: b4f6243634a48426f7aa914b23e4a4b952ffc4f0b82cadbdfd6665e115cf1b5d
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/431946152/getrobux-come-game-hack PDF link annotation
    • http://sttlets.education/senayan/repository/free-minecraft-java-edition_GM479516143.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/how-to-hack-in-attrition-roblox_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/roblox-valentine-generator-free-robux_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/how-to-change-roblox-name-for-free-2021_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/how-to-get-free-robux-2021-mac_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/rbxcashcom-watch-videos-complete-offers-withdraw-to-robux-for-free_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/free-robux-working_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/how-to-give-people-free-robux_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/fighting-free-card-coin-master_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/roblox-speed-hack-2021-march_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/how-to-get-vip-server-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/exploit-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/how-do-you-earn-robux-for-free_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/tiktok-free-view-year_GM835599320.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/coin-master-hack-using-cheat-engine_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/how-to-get-free-robux-a-simple-way_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/roblox-epic-minigames-speed-hack-download-free-2021_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/coin-master-free-spins-gratis_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/coin-master-daily-free-spins-link-2021-today_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_off000032ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32EA 23076 bytes
SHA-256: 6bd819051e328e0a0e55badbf6f1440e89252bfb36304311b7fbd50840f2f0e3
font_01_sfnt_off000066ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66AC 18916 bytes
SHA-256: f81d68fe278d8ac86eb0b8e96636390d19113ae7fbe58b33a1d644febb5584d3

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