Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b336fc68bfa904…

MALICIOUS

PDF

34.1 KB Created: 2021-06-28 08:22:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 98a9891cac3ad83ff67d3abec456918a SHA-1: 8ba993fb31c8e024fd6c448106b64e98b03dc816 SHA-256: 31b336fc68bfa904d3d393d72e9c2857ad84444300616bea7a4e180fcec24fd0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically advertising free generators or hacks for popular games. The heuristic firings indicate these links are part of a known malicious redirector chain. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a social engineering lure designed to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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-n-ame-change-on-roblox-game-hack In PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-are-people-hacking-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-free-spins-bit-ly_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-tokens-roblox-assassin_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-robux-pastebin-hack-2021_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-get-free-and-easy-robux_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/hacks-for-hole-in-the-wall-roblox_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-ro-goul-hack-cheat-engine_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/minecraft-for-macbook-free_GM479516143.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-role-in-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/hackear-cuenta-de-roblox-2021-pastebin_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/redline-roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-get-free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-robux-codes-on-phone_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/check-cashed-cheat-engine-for-roblox_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-and-spin_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/wwwhacktoolcom-freedownload-roblox_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/5-games-that-actually-give-you-free-robux_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_off00002e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E19 22480 bytes
SHA-256: 0940a2d461927b7056b3fb4c8241189079eee66e14b7aeba379eba426f2df420
font_01_sfnt_off0000606a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x606A 19076 bytes
SHA-256: 45368691f99639e70a9a276c8282cb99a9c71bc32b6d52685c8262e04ceadee0