Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f15dca69c5339d0…

MALICIOUS

PDF

36.2 KB Created: 2021-06-30 08:55:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8a0f712df0e2e1f802cb0c31d1c75cc0 SHA-1: 5cb9c0b2712e17e8f1731afc8f61c1757f1484f3 SHA-256: 5f15dca69c5339d03b0eb885a4f4beacdf481cdf5e2ddf44029e38a2590ce8f3
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one to a known malicious redirector, masquerading as a 'free generator / game hack'. The document body and heuristics indicate a lure for free game currency or hacks, likely leading to phishing or malware downloads. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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-robux-no-offers-or-human-verification-game-hack In PDF document text
    • http://lib.stimykpn.ac.id/repository/fbchampion-com_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-free-spins-link-download-free_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-spin-coin-master-twitter_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-doing-tasks_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-legends-of-speed-hack_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/pokemon-go-free-64-bit_GM1094591345.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-free-shields-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-from-obby_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/minecraft-realms-free-trial_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/get-free-spins-on-coin-master-links_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/xxlolaplaysxd-free-robux-help_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/tiktok-free-pro-app-download_GM835599320.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-hack-in-roblox-martial-arts-battle-arena-kai_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/sites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/the-cheats-mac-roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-no-password-or-username_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_off00003489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3489 22868 bytes
SHA-256: 1fc416bd3192f4248cd86f94e0dcbdd1f83fdeaf4ffd09be121f65690871c2d4
font_01_sfnt_off000067a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67A4 19336 bytes
SHA-256: ae9f775c70203eb7dcd93a555ba6b91b4aec979334340306e1e4845c29b35281

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