Malicious PDF — malware analysis report

Static analysis result for SHA-256 597dabdf677f2cdd…

MALICIOUS

PDF

49.3 KB Created: 2021-06-03 16:27:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 356208d84b3577aa11c185ef851aea3c SHA-1: f314e82c91a7b87637646ab46b61376bee6e8365 SHA-256: 597dabdf677f2cdda3d4e1981b310994b2c2ef808c5be5cb5b91926b269c818d
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to a known malicious redirector, disguised as free game hacks or generators. It also displays a fake CAPTCHA to trick the user into interacting with the malicious content. The primary goal appears to be directing users to potentially harmful websites through social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 5

  • 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.
  • 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
  • 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.online/app/431946152/free-robux-safe-game-hack In PDF document text
    • https://www.andrology.co.uk/uploads/files/files/get-free-coin-master_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/hacked-client-for-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-tiktok-followers-no-human-verification_GM835599320.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/what-is-exploiting-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-minecraft-printables_GM479516143.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/minecraft-bedrock-edition-pc-download-free_GM479516143.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/microsoft-robux_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-mster-free_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/is-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-roblox-followers-generator_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/public-enemy-sun-prairie-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/pokemon-go-free-808_GM1094591345.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/get-me-free-robux_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-minecraft-server-hosting-with-plugins_GM479516143.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_off00005108.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5108 27076 bytes
SHA-256: f14ae308cba204f5a6d4728fae4125d8e7f221e2547fda49cb4d2f7acfa9582b
font_01_sfnt_off00009145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9145 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E57 18244 bytes
SHA-256: 393a0339ec2761f14ea9b29efa8c9c5fc9788b4979bd41a030a3ecef46023b5f

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