Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf33c8295be4528…

MALICIOUS

PDF

33.0 KB Created: 2021-07-06 12:09:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 370fc9090331d1963169db109202e54b SHA-1: 56c47190a41dae1085e0c7046c4a7250fe93ca36 SHA-256: 1bf33c8295be4528aff6383b0f3d8ef0c9493ebdb6497b49eb56a1eff550a203
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a 'game hack' lure to entice users into clicking embedded links. The primary link directs to a suspicious domain, while the document also contains a large number of SEO-optimized PDF links, suggesting a link farm or redirector strategy. The ML classifier strongly indicates maliciousness, and the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/real-roblox-game-hack PDF link annotation
    • http://digilib.stimata.ac.id/repository/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/how-to-get-free-stuff-roblox-ipad_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-roblox-exploit-dll-namedpipe_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/vesteria-roblox-free_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/how-to-download-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/how-to-get-roblox-free-clothes_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-time-hack-ios_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-exploits-for-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-pet-food-hack_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-spins-coin-master-october-13-2021_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-spin-coin_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coolest-free-items-on-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-domain-for-minecraft-server_GM479516143.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/good-avator-free-20-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-minecraft-education-edition_GM479516143.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/20210-robux-free_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_off00002d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D26 21812 bytes
SHA-256: cc0704f2057e7cb15eaadd0a3201b8637dc12ef819157a113fb739e2d4f80b92
font_01_sfnt_off00005d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D2B 18484 bytes
SHA-256: 7f0f55fb7efe68b4890159f191db407b63f8f65986d021ee8cd072538b6ccf6b

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