Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4b5b0805f8bfcb…

MALICIOUS

PDF

45.0 KB Created: 2021-06-10 19:26:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 64e3071bb43bbd6c4f33abf85606f13f SHA-1: 9848d39b9f32693034395ecf23afdfcf9ae3b3ff SHA-256: ac4b5b0805f8bfcb2209566a9f456b599cb3b99c54b5ad727a86679f7c1cc490
200 Risk Score

Malware Insights

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

The PDF contains a link to a malicious redirector disguised as a game hack, designed to trick users into downloading further malware. The document body and heuristics indicate a fake CAPTCHA or human verification prompt, further supporting the lure to trick users into executing malicious content. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/8rsh-roblox-jailbreak-free-vip-server-game-hack In PDF document text
    • http://reggieslockandkey.com/images/free-minecraft-coins_GM479516143.pdfIn PDF document text
    • https://reggieslockandkey.com/images/coin-master-hacks_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/hack-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-coin-master-spin-generator_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-roblox-gfx_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/get-free-robux-now_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/muscle-roblox-manequin-free_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-tshirts-fixed-roblox_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-robux-no-download_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-roblox-cards-pin-number_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/play-full-version-of-minecraft-for-free-no-download_GM479516143.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-robux-images_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/roblox-printables-free_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/hacker-minecraft-song_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
stream_004_off00005080.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5080 24912 bytes
SHA-256: 9117adf1a6587c4451b8c9646e025982ba875428763b1145343dc3f41f100fec
font_01_sfnt_off000089fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89FA 19432 bytes
SHA-256: 36753a9b92769637fa200bd02c5324fe641b039edd35da08e2cb64565805d463

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