Malicious PDF — malware analysis report

Static analysis result for SHA-256 427f7d093f8ebf87…

MALICIOUS

PDF

42.5 KB Created: 2021-05-16 02:07:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 9c43966a72b76d2abfffe198b8a54d67 SHA-1: e6e69339a1e406ec84b7dc387d8d0d46f214a916 SHA-256: 427f7d093f8ebf874a46f48be49f472a1e66095b1f08f336941b8e4cf3fb15c5
200 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA and lure text to entice users into clicking malicious links, such as the one pointing to 'robux-2021-game-hack'. The presence of multiple links to external PDF files hosted on 'fridaytravelnepal.com' suggests a multi-stage attack designed to deliver a payload. The ML classifier strongly flagged this PDF as malicious, reinforcing the observed redirection and lure tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/431946152/robux-2021-game-hack In PDF document text
    • https://fridaytravelnepal.com/userfiles/files/roblox-hackers-list_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-coin-master-spins-no-human-verification_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/roblox-heroes-online_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/real-coin-master-hacks_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/roblox-promo-codes-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/mosttechs-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/coin-master-free-spins-5-10-2021_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/cool-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/archery-master-3d-unlimited-coins-hack_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/coin-master-spins-free-2021_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/static-moonactive-net-rewards-2021_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/no-robux_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-coin-master-cards-link_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/guide--coin-master-free-tips_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/how-to-get-free-cards-sets-for-coin-master_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-coin-master-spins-and-coins_GM406889139.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_off000047e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47E4 26608 bytes
SHA-256: eeda31fa3ee6fa15b908187d6a0fd96798927f50fcfb3491376e8da56eff69f2
font_01_sfnt_off000083e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83E0 18252 bytes
SHA-256: f22572533f4e8da48e03a48f0d29ce3544a01a0bd2cb3d9374f1b8b189e2707b

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