Malicious PDF — malware analysis report

Static analysis result for SHA-256 3db2779fbcf9ce94…

MALICIOUS

PDF

35.0 KB Created: 2021-07-03 18:21:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 88d32bef95cf32ec1afb1a90ad3cfe2d SHA-1: 15256b42d4eb1e9ec6885b41ba1b16963eff9200 SHA-256: 3db2779fbcf9ce941007c0f4e56ee89c618f8a14fa59b11cdf457f0a771082bc
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains links that redirect to malicious infrastructure, masquerading as generators for game currency or hacks. The ML classifier strongly indicated maliciousness, and the presence of multiple redirector links confirms a malicious workflow. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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-roblox-acc-game-hack In PDF document text
    • http://lib.vipklh.ru/repository/how-do-you-get-free-food-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/a-wolf-or-other-roblox-otter-space-cheats_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/blox-pink-robux-free_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/www-robux-free-win_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-free-rubox_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-prison-life-v20-cheats-noclip-and-btools_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-dll-scripts-for-roblox_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/minecraft-redeem-code-free_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-free-robux-on-roblox-pc-2021_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/pig-master-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/running-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/cheat-engine-roblox-jailbreak-speed-hack_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-free-spin-and-coin-link-2021-today_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/minecraft-servers-that-allow-hacks_GM479516143.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_off000032e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32E0 22520 bytes
SHA-256: 144d4150077cfc5f35353d0c27766b92f40e5cf90479e55456072076ab253588
font_01_sfnt_off00006522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6522 18652 bytes
SHA-256: 897dbc28d09cb323d8d959c0643642adc43f046846d73b8db675e87b41f7de50

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