Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c446c39d75818e6…

MALICIOUS

PDF

44.9 KB Created: 2021-06-07 00:27:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: f57dedb1ae77eb52d5d90733f47e27dd SHA-1: a5719f84a461c4ba4c348c7fcf13f2a614d42c73 SHA-256: 9c446c39d75818e6c54b07baa7f6fd5ad278f4a437fd5c3d2b158d467776e8d1
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors, disguised as "free generator / game hack" lures. The document body and heuristics indicate a fake CAPTCHA or human verification prompt is presented to trick users into clicking these links. The primary link leads to infrastructure associated with malicious redirects, likely serving as a lure for further exploitation or malware delivery.

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/free-robux-rixty-codes-2021-game-hack In PDF document text
    • https://elite-house.su/images/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://elite-house.su/images/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://elite-house.su/images/how-to-get-free-hair-on-roblox_GM431946152.pdfIn PDF document text
    • https://elite-house.su/images/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://elite-house.su/images/pop-slots-free-vegas-casino-slots-machine-game-coin-master_GM406889139.pdfIn PDF document text
    • https://elite-house.su/images/minecraft-free-version_GM479516143.pdfIn PDF document text
    • https://elite-house.su/images/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • https://elite-house.su/images/free-robux-exe_GM431946152.pdfIn PDF document text
    • https://elite-house.su/images/free-minecraft-java-account_GM479516143.pdfIn PDF document text
    • https://elite-house.su/images/free-minecraft-mods-for-xbox-one_GM479516143.pdfIn PDF document text
    • https://elite-house.su/images/free-robux-generator-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://elite-house.su/images/minecraft-pc-free_GM479516143.pdfIn PDF document text
    • https://elite-house.su/images/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://elite-house.su/images/coin-master-free-spins-and-coins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://elite-house.su/images/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • https://elite-house.su/images/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://elite-house.su/images/get-free-robux-now_GM431946152.pdfIn PDF document text
    • https://elite-house.su/images/free-roblox-gift-card-codes-2021-unused_GM431946152.pdfIn PDF document text
    • https://elite-house.su/images/minecraft-free-download-pc_GM479516143.pdfIn PDF document text
    • https://elite-house.su/images/get-free-tiktok-likes_GM835599320.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_off00005189.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5189 25088 bytes
SHA-256: ece296bc39504e65fa022609de84d88423e5e5f39ae1e437421ccba6586b23a9
font_01_sfnt_off00008a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A90 18996 bytes
SHA-256: 6279888a13cb1b73a6ba7014985ecf88351cc1da22964e17b7a2bbfe901b3e6f

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