Malicious PDF — malware analysis report

Static analysis result for SHA-256 59924b90fe7f52e6…

MALICIOUS

PDF

33.9 KB Created: 2021-07-07 23:53:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 77bfcbd3713df720cd013f7f5cacde8c SHA-1: 8573a4d4d7967bdce6559f94203ccdb0d6c3250e SHA-256: 59924b90fe7f52e6c2958f581e418dcdda27732dc3af9d6539d59c188d4a34a6
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one to a known malicious redirector, disguised as game hacks and cheats. The document body explicitly mentions 'Fight Club Hack Roblox' and provides a direct link to a suspicious URL, indicating a lure to a potentially malicious site. The presence of multiple PDF links suggests an attempt to create a link farm or distribute further malicious content.

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/fight-club-hack-roblox-game-hack In PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-hacks-mas-fuertes_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-free-minecraft-alts_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-free-v-bucks_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/guest-chat-cheat-engine-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-builders-club-for-free-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/hack-for-boobs-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-roblox-items-codes-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/serveur-discord-hack-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-free-spins-generator_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/do-you-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/games-that-give-free-robux-without-pass_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/minecraft-coins-free_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-how-to-enter-cheat-codes_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/hack-para-atravesar-paredes-en-roblox-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-glitch-no-hack-2021_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_off00002de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DE4 22288 bytes
SHA-256: 72859caf4f49308dbed86fcc86374f9e667e3854a6142d712bf3fee069f2cfd8
font_01_sfnt_off00005eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5ECA 19348 bytes
SHA-256: 5648edd1814a0b7c0577fd2aa449f231e234f249b3473d08b55b0a3af2b571fe

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