Malicious PDF — malware analysis report

Static analysis result for SHA-256 10e515b6c0e1b315…

MALICIOUS

PDF

51.0 KB Created: 2021-06-09 09:02:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 1432a8a9ea3558db41d17b0dd803e780 SHA-1: ca9003cc6ef7227b50fcdb28c7405b52bccc2b34 SHA-256: 10e515b6c0e1b3153777faf949a387319f34b3470843191b54e6ebd735554dc7
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites offering game hacks and free currency, a common lure for phishing or malware distribution. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK indicates that at least one of these links points to known malicious infrastructure. The document body, though partially garbled, contains references to 'Roblox Hack Crazy' and a URL that aligns with the malicious redirector findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9724

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 https://netcdn.tw/app/431946152/roblox-hack-crazy-game-hack In PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-free-roblox-hair_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/master-coin-hack-app_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-online-without-human-verification_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-unlimited-coin-master-online-tool_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-java-edition-free-download_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-pe-apk-free-download_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/moonactive-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/game-hunters-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-hacks-on-minecraft_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/robux-scam_GM431946152.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/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/get-free-lives-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-heaven-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/minecraft-tower-defense-hacked_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/hack-robux_GM431946152.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_004_off000052c4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52C4 31908 bytes
SHA-256: e468870cbbf54450e6ce474d96c17d77e6db81aa978df3ccd6d9a4dda2271caf
font_01_sfnt_off00009a68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A68 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off0000a417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA417 18444 bytes
SHA-256: 8a7703480cf4d3526bd7549795ebb18b00fed88e6059c1f4c53a03f4835768fe

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