Malicious PDF — malware analysis report

Static analysis result for SHA-256 c653a2ddf6699ac3…

MALICIOUS

PDF

34.0 KB Created: 2021-07-06 12:35:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 19dc96ba1da91e2e3528fdf86d3328cf SHA-1: df64657ceab617b615e4a8f92cf24cfc5521fc0d SHA-256: c653a2ddf6699ac33d993dca2c0a53315ed22673a8a6c2b5f618ae5fbf84a337
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a common lure of game hacks and free currency to trick users into clicking malicious links. The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm designed for SEO manipulation or to host further malicious content. The primary URL http://netcdn.tw/app/431946152/roblox-person-game-hack is likely a gateway to a second-stage payload or phishing page. The ML classifier strongly indicates maliciousness.

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/roblox-person-game-hack PDF link annotation
    • http://lib.stimykpn.ac.id/repository/roblox-fashion-frenzy-free-games_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-hack-apk-no-fb-login_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/hack-roblox-fixed-pc-infinity-heroes-x100_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-server-side-exploit-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-pastebin-raw_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-how-to-get-free-pet_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-free-swords_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/robux-page_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-dayz-cheats_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/unlock-my-games-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-hack-a-youtuber-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-pinewood-core-op-weapons-free_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-com-hack_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-free-faces-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/cheat-engine-roblox-crash_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/walkspeed-hack-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
font_00_sfnt_off00002f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F70 22348 bytes
SHA-256: 37ea828de39e2050418ea47c6eab95de0940c2f5b535280712108453c6b365f2
font_01_sfnt_off00006107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6107 18640 bytes
SHA-256: 09d5a88f13f944da1704f58202821fce0fe2f4e75a0aa2a37ce07a6f7a2fb755

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