Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cb775ebdde3e630…

MALICIOUS

PDF

47.9 KB Created: 2021-05-10 23:22:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 56a61c1b66729e2d2bbed0417f8a6a81 SHA-1: f14fe5f4c5d859add43f9315c138664d43550af6 SHA-256: 7cb775ebdde3e630c7b8fb9bbfa851ed119fafe6f9e838a8b5415750d6c59133
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirectors and external sites, disguised as a 'free generator' or 'game hack' lure. The presence of a fake CAPTCHA heuristic indicates a social engineering tactic to trick the user into interacting with the malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lead the user to malicious websites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8715

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/free-robux-discord-game-hack In PDF document text
    • https://privatearrangements.co.nz/public/files/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • https://privatearrangements.co.nz/public/files/original-roblox_GM431946152.pdfIn PDF document text
    • https://privatearrangements.co.nz/public/files/free-minecraft-hosting_GM479516143.pdfIn PDF document text
    • https://privatearrangements.co.nz/public/files/is-coin-master-hack-safe_GM406889139.pdfIn PDF document text
    • https://privatearrangements.co.nz/public/files/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • https://privatearrangements.co.nz/public/files/john-doe-roblox-hacker_GM431946152.pdfIn PDF document text
    • https://privatearrangements.co.nz/public/files/coin-master-free-spins-link-2021-twitter_GM406889139.pdfIn PDF document text
    • https://privatearrangements.co.nz/public/files/minecraft-coins-free_GM479516143.pdfIn PDF document text
    • https://privatearrangements.co.nz/public/files/coin-master-hack-online-generator_GM406889139.pdfIn PDF document text
    • https://privatearrangements.co.nz/public/files/robux-free-online_GM431946152.pdfIn PDF document text
    • https://privatearrangements.co.nz/public/files/coin-master-time-speed-hack_GM406889139.pdfIn PDF document text
    • https://privatearrangements.co.nz/public/files/how-to-get-creative-mode-in-minecraft-server-hack_GM479516143.pdfIn PDF document text
    • https://privatearrangements.co.nz/public/files/get-roebucks-com_GM431946152.pdfIn PDF document text
    • https://privatearrangements.co.nz/public/files/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • https://privatearrangements.co.nz/public/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://privatearrangements.co.nz/public/files/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • https://privatearrangements.co.nz/public/files/easy-robux-hack_GM431946152.pdfIn PDF document text
    • https://privatearrangements.co.nz/public/files/roblox-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://privatearrangements.co.nz/public/files/roblox-fun-com-robux_GM431946152.pdfIn PDF document text
    • https://privatearrangements.co.nz/public/files/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000498c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x498C 23840 bytes
SHA-256: 32750564ed6d57fb79baf4dcc6914c2216e3969250ff2c77f4eff11f7cf8c401
font_01_sfnt_off00007fc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FC3 2820 bytes
SHA-256: 972979c3a46100cf5f8fd289bc6fbd2496ff75fec0e3f6753648c72ec6eba714
font_02_sfnt_off0000895e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x895E 6100 bytes
SHA-256: f866077ce59d6ea276f75e4af76daa2aab5f3a1a679df144776123d85664d65c
font_03_sfnt_off000097ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97EA 18476 bytes
SHA-256: bd0365f7f2eefd731cbfcd90ede0e91cb43578b4b980f4195e4871e1034addc2

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