Malicious PDF — malware analysis report

Static analysis result for SHA-256 f162904362ffc2de…

MALICIOUS

PDF

42.2 KB Created: 2021-05-13 06:46:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 9f25fcf54d3f5fcb456638ed6628b498 SHA-1: 0a22e54d2ecd2908b729856bdffe005aa94b6e7a SHA-256: f162904362ffc2de5f8763b023eb9c8b5464867cbfbd7dc3d4a4aeff4b3973a1
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a fake CAPTCHA lure and multiple links to known malicious redirectors, including one that masquerades as a game hack. The primary malicious link identified is https://netcdn.xyz/app/479516143/was-minecraft-ever-free-game-hack. This suggests the document is designed to trick users into clicking through to potentially malicious websites, likely for phishing or malware distribution.

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/479516143/was-minecraft-ever-free-game-hack In PDF document text
    • http://library.acehresearch.org/repository/roblox-royale-high-diamond-hack_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/are-robux-generators-safe_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/links-to-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/minecraft-login-free_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-hack-no-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-spins-link-iphone_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-heaven-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-login-hack_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-rewards_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-monster_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-on-facebook_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/best-way-to-get-free-robux_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_003_off00004aee.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AEE 25176 bytes
SHA-256: afefe22f6a2356b1b1c9b621020199535998c87e9c737fd9b14ae14d28e94569
font_01_sfnt_off00008408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8408 17880 bytes
SHA-256: fa9564ce5793f03604dae66ea4261aaef87f9e1e7420b634dd5196a1b51aa919

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