Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf712f4086a8c3d2…

MALICIOUS

PDF

35.5 KB Created: 2021-06-19 00:22:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: a9cfb2c226a969c10e00d82b78cb078c SHA-1: c184014e163679c05d81a753f73d5f51a8dfe4b3 SHA-256: bf712f4086a8c3d236c5dda5432489c8cc46e1fa09edc1bed030564ae83c770a
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, including one to a known malicious redirector at http://netcdn.co/app/431946152/free-paypal-accounts-with-money-for-roblox-game-hack. The document body and heuristics indicate a lure for free game items or accounts, designed to trick users into visiting these malicious links. The presence of multiple SEO-optimized PDF links suggests a link farm intended to drive traffic to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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
  • 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/free-paypal-accounts-with-money-for-roblox-game-hack In PDF document text
    • https://pustaka.mic.sch.id//repository/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/roblox-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/free-roblox-supream-pants_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/free-coin-master-game_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/is-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/coin-master-hack-no-survey_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/roblox-web-store-hack_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/free-robux-safe_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/how-to-hack-coin-master-game-ios_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/minecraft-survival-hacks_GM479516143.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/free-robux-for-free_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/how-to-get-a-lot-of-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/free-spins-coin-master-no-survey_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/how-to-use-cheat-engine-on-roblox-for-robux-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_off00002fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FD6 23004 bytes
SHA-256: 390dd2f77b87ba57f0a211b024a3acfeb4a4b6a0e933d2c1b797e7107c9d1caf
font_01_sfnt_off00006304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6304 20084 bytes
SHA-256: a4bd2666cc7753f57b15089b7521951e1e48bf72cf0fdecb083302193bef1ba3

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