Malicious PDF — malware analysis report

Static analysis result for SHA-256 00633dec7bb0dee4…

MALICIOUS

PDF

36.0 KB Created: 2021-06-19 10:11:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 9f274de56f8ffe68b6081f5a57d2ba95 SHA-1: 007533551d1cddf92fa9da4818f94cefd53344f0 SHA-256: 00633dec7bb0dee4ee3418ec868d6774689f26e6c90a8f32104699fdb046793f
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free items and game hacks to redirect users to malicious infrastructure. The document body and heuristics indicate a link farm designed to drive traffic to potentially malicious sites, including a known redirector. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a malicious workflow aimed at user deception and potential further compromise.

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/how-to-get-free-headphones-on-roblox-2021-game-hack In PDF document text
    • https://digilib.stimlog.ac.id/repository/bad-minecraft-free_GM479516143.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/hack-coin-master-mod-apk_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/robux-generators-that-actually-work_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-hack-2021-without-verification_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/youtube-roblox-how-to-get-a-free-dominus_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-without-human-verification-on-phone_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-roblox-games-scripts_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/minecraft-windows-10-free-with-java_GM479516143.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/1x1x1x1-hacker-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/minecraft-alt-accounts-free_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-digimon-aurity-hack_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-make-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-hack-tool-exe_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-free-coins-twitter_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/flip-master-free-coins_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/compile-roblox-hack-dll_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
stream_002_off000031f9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31F9 22856 bytes
SHA-256: 673c9439876637ea46a951238c213c3de28cd1d3a73f48c202fc406f0e8e4e0c
font_01_sfnt_off0000652b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x652B 19836 bytes
SHA-256: 79a322dd46f0c013667b1332ee60e4ed862292b09b4915fbe660ba03738c6c51

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