Malicious PDF — malware analysis report

Static analysis result for SHA-256 c217c46e348913ba…

MALICIOUS

PDF

33.6 KB Created: 2021-07-04 01:59:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 9235f0bcd2ae5bf270026c3d011731ac SHA-1: 186a29476db6883fcef066055f9c41d14eb71ee5 SHA-256: c217c46e348913baab0a52c6b873ec714ad2206b7baddfa16cb79c66656ea412
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is designed as a lure, presenting itself as a 'Robux Generator' and containing numerous links to external PDF files and a malicious redirector. The primary goal appears to be directing users to potentially malicious websites through a link farm, likely for further exploitation or scamming. No scripts were extracted, but the document's structure and embedded URLs strongly indicate a phishing or scamming attempt.

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.tw/app/431946152/robux-generator-that-works-game-hack In PDF document text
    • http://lib.uho.ac.id/library/repository/castle-black-free-to-take-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-spins-and-coins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-game-pack-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/roblox-fun-com-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-make-a-free-server-in-minecraft-java_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/pubg-uc-10_GM1330123889.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/hacks-for-mortem-metallum-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/cheat-apocalypse-rising-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/what-do-roblox-points-do_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-free-hair-on-roblox-no-hack_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-make-a-server-in-minecraft-java-for-free_GM479516143.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_off00002ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EC9 21440 bytes
SHA-256: a4b48834ac08675c1264209c1cc870f48fc4806e2963a2c2d8ec142654ea7c8e
font_01_sfnt_off00005db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DB0 19188 bytes
SHA-256: ccc77926c6d9f36711ba9a2232d7c5723157e500c42e1f45c9b9e4f6db9b0194

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