Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff9ab2d396230106…

MALICIOUS

PDF

47.1 KB Created: 2021-06-03 08:44:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 9021978a390115e588bb9fd1d392deb0 SHA-1: ee65db4dc164ecdad1026c6351cf47dd33e4eb6a SHA-256: ff9ab2d396230106f23ba827c0019684bdb56b21102fa090c4538f01ffa273e6
200 Risk Score

Malware Insights

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

The PDF document contains a lure for a 'free generator / game hack' which redirects to a malicious URL. It also displays a fake CAPTCHA to trick the user into interacting with the document. The presence of embedded URLs and the nature of the lure suggest a phishing or scam attempt, likely leading to further malware download or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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/how-to-get-800-robux-for-free-game-hack In PDF document text
    • http://library.acehresearch.org/repository/tryrbx-site-free-robux_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-please_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/robux-apk_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-pet-food-links_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-spins-link-2021-hack_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-mod-apk-unlimited-spin-download-free-full-version_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-heaven-free-spins-link_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-spins-coin-master-links-twitter_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-hack-people-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/minecraft-games-free-to-play-online_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/client-minecraft_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-hack-game_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/robux-earning-websites_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/robux-download_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-report-hacker_GM431946152.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_off000053f3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53F3 28256 bytes
SHA-256: c21397e76ecfa1d73cfcf84e829413da1128a6aba04a450c5a2a8e1c6b4791d8
font_01_sfnt_off0000946d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x946D 18664 bytes
SHA-256: 6a64e7471bea66bf256778f320a62da21f5461e8ce3828893f1d9cd09bca5c64

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