Malicious PDF — malware analysis report

Static analysis result for SHA-256 381943a9f98e576c…

MALICIOUS

PDF

34.6 KB Created: 2021-07-04 13:13:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 0f7125fe70da62f531a450ad41b05bfb SHA-1: 311cfd4fed7c5d85b66f954ae6e839dc86db3734 SHA-256: 381943a9f98e576c8340f9d66e019723f0748186da9d04bd3ea9cd03f646f68a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links, including one identified as a malicious redirector. The document body and heuristics suggest a lure for game-related cheats or currency, likely leading to a malicious download or phishing site. No scripts were extracted, but the presence of embedded URLs and the nature of the lure indicate a high likelihood of malicious intent.

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/406889139/free-spins-on-coin-master-game-hack In PDF document text
    • https://balibalotour.com/new/public/ckfinder/userfiles/files/how-can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://balibalotour.com/new/public/ckfinder/userfiles/files/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • https://balibalotour.com/new/public/ckfinder/userfiles/files/free-links-coin-master_GM406889139.pdfIn PDF document text
    • https://balibalotour.com/new/public/ckfinder/userfiles/files/client-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • https://balibalotour.com/new/public/ckfinder/userfiles/files/how-can-i-get-robux_GM431946152.pdfIn PDF document text
    • https://balibalotour.com/new/public/ckfinder/userfiles/files/roblox-gta-5-hack_GM431946152.pdfIn PDF document text
    • https://balibalotour.com/new/public/ckfinder/userfiles/files/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • https://balibalotour.com/new/public/ckfinder/userfiles/files/coin-master-free-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://balibalotour.com/new/public/ckfinder/userfiles/files/oprewards-robux_GM431946152.pdfIn PDF document text
    • https://balibalotour.com/new/public/ckfinder/userfiles/files/bux-gg-robux-free_GM431946152.pdfIn PDF document text
    • https://balibalotour.com/new/public/ckfinder/userfiles/files/www-coinmaster-com_GM406889139.pdfIn PDF document text
    • https://balibalotour.com/new/public/ckfinder/userfiles/files/cheat-for-roblox-tix_GM431946152.pdfIn PDF document text
    • https://balibalotour.com/new/public/ckfinder/userfiles/files/coinmaster-blogspot_GM406889139.pdfIn PDF document text
    • https://balibalotour.com/new/public/ckfinder/userfiles/files/cm-free-spins_GM406889139.pdfIn PDF document text
    • https://balibalotour.com/new/public/ckfinder/userfiles/files/how-to-get-creative-mode-in-minecraft-server-hack_GM479516143.pdfIn PDF document text
    • https://balibalotour.com/new/public/ckfinder/userfiles/files/coin-master-100-spin-slot_GM406889139.pdfIn PDF document text
    • https://balibalotour.com/new/public/ckfinder/userfiles/files/can-you-get-a-warn-for-hacking-on-roblox_GM431946152.pdfIn PDF document text
    • https://balibalotour.com/new/public/ckfinder/userfiles/files/how-to-get-free-robux-on-chromebook_GM431946152.pdfIn PDF document text
    • https://balibalotour.com/new/public/ckfinder/userfiles/files/roblox-piano-hack_GM431946152.pdfIn PDF document text
    • https://balibalotour.com/new/public/ckfinder/userfiles/files/coin-master-free-spins-cheats_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3267 22780 bytes
SHA-256: f60ff4c86ed060004ceec4868b16b1211720409626cbc1402afd35ba776526c5
font_01_sfnt_off000064fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64FC 18176 bytes
SHA-256: 1d97d559b00188de25375047baff616ad70156a7868f4dca1def947dc1a2c5ee

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