Malicious PDF — malware analysis report

Static analysis result for SHA-256 88bc8c58c876207c…

MALICIOUS

PDF

49.1 KB Created: 2021-06-11 08:56:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c5fbbb80d3136cb622f85a463a306675 SHA-1: 3d38cad14918e21dfab597bd7362cde3702873d4 SHA-256: 88bc8c58c876207c85a36498eca0d629edae80a983df0bbfe67d21ed18cace80
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a fake CAPTCHA lure and numerous links to external websites, many of which are hosted on a link farm. The primary URL leads to a 'game hack' generator, suggesting a social engineering tactic to lure users into potentially malicious sites. The document body and heuristics indicate a focus on game-related cheats and hacks, a common lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/how-to-make-a-shirt-in-roblox-free-2021-game-hack PDF link annotation
    • http://perpustakaan-stikesmsb.com/repository/coin-master-unlimited-spins-apk-free-download_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/spin-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/points-for-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/all-roblox-promo-codes-free-items_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/como-convertirse-en-hacker-en-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/roblox-its-not-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/100-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/is-minecraft-realms-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/minecraft-apk-free-download-016-0_GM479516143.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/hilton-hotels-lua-hack-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/minecraft-114-4-download_GM479516143.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/is-minecraft-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/download-hacked-games-com-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/roblox-comroblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/coin-master-cracked-apk-free-download_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005241.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5241 26900 bytes
SHA-256: 9ea75d5982a26a0ddb6f14dfc74ad222e2608d394a722c6a57c71e621b42d1be
font_01_sfnt_off00008fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FD8 2912 bytes
SHA-256: 02b35010e2614e3cc95ac6414c49295350c91fdfcc4b4cad27ffdbc10e80df7f
font_02_sfnt_off000099d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99D4 19496 bytes
SHA-256: 06d55140a1d9aba491e5a833760f4987c27b9902f0249c7469b5e1b14abbb4bd

Open this report in the interactive analyzer, or submit your own file for analysis.