Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb88a625b88c9568…

MALICIOUS

PDF

35.6 KB Created: 2021-07-05 20:19:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 66b14a2e19831154269f84e1547de6a4 SHA-1: 7f5e3f377c3a3047e510f7d5a8bac95cc2fa9827 SHA-256: bb88a625b88c95683ec3c96a1050c47677d95b4bb20bf59d4ce5a747f49282bf
160 Risk Score

Malware Insights

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

The PDF document contains a lure for free game currency or hacks, directing users to a URL associated with malicious redirectors. The ML classifier strongly indicates maliciousness, and the embedded URL is a primary indicator of the attack's intent to lead users to potentially harmful content. No scripts were extracted, but the PDF structure and embedded URL are sufficient to infer a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/free-robux-no-human-verification-or-survey-or-download-game-hack In PDF document text
    • http://lib.kunci.or.id/repository/coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/get-roebucks-com_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/roblox-boxing-simulator-2-hack-xbox_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/roblox-hack-tools-in-all-games_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/hallows-eve-2021-roblox-cheats_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/hack-shrek-roblox_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-roblox-codes-that-work_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/roblox-december-2021-cheat-engine-speed_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/hacks-para-roblox-lumber-tycoon-2_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/roblox-hack-tools-download-2021_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/back-free-items-roblox_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/roblox-bloxburg-hack-money_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-robux-no-eyes-no_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/noob-vs-pro-vs-hacker-vs-god-minecraft_GM479516143.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-robux-easy-and-fast_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/roebucks-on-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_off00003131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3131 22244 bytes
SHA-256: 7726d4caddaa4504a4cc99f5a56faeaa69f4c4fbeff171b71d223ca794ddfa3a
font_01_sfnt_off0000628e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x628E 20208 bytes
SHA-256: 76b0661ef1631e3ff5be93da9b7a1da7a58595af6d3396f266def641a9cc9522

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