Malicious PDF — malware analysis report

Static analysis result for SHA-256 215f6a53510a954d…

MALICIOUS

PDF

46.2 KB Created: 2021-06-11 12:10:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ca17683d6e2110d03273e1fe8a5f690c SHA-1: 69e5f1cdc7ca5102b037f30b92234863705af2f5 SHA-256: 215f6a53510a954d70e0e7f37fc8631cf5e672ab2688043fe9b0e847ffeed432
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of "free generator / game hack" to entice users. It contains a large number of external links, many pointing to other PDFs hosted on similar domains, suggesting a link farm or redirector infrastructure. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.tw/app/431946152/roblox-shirt-white-free-game-hack PDF link annotation
    • https://library.uigm.ac.id/repository/coin-master-guide-to-free-spins-and-rewards_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/coin-master-hack-here_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-100-robux_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/hack-for-roblox-bee-swan_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-roblox-object-en-vedette-paster_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/coin-master-sound-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/coin-master-blogspot_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-minecraft-printables_GM479516143.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-robux-play-games-earn-points_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/roblox-cheats-for-robux-on-ipad_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/adopt-me-hack-roblox-money_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-get-free-outfits-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/get-free-spins-on-coin-master-links_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/hack-coin-master-apk-32-download_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/coin-master-unlimited-spin-link_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/admin-command-hack-guide-roblox_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_004_off00005129.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5129 27728 bytes
SHA-256: e71e0bbf39935f3842017af984a3970437d9fd84de990c5f67829128fda3e0ca
font_01_sfnt_off0000913f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x913F 18536 bytes
SHA-256: e9919e5e9f5570201425b3b21cbcc7ffb2ec54a51520d3774f4ca30de1cc5b50

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