Malicious PDF — malware analysis report

Static analysis result for SHA-256 78d33d0e3d0f693b…

MALICIOUS

PDF

44.7 KB Created: 2021-06-10 22:04:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b644d0783c216e2246519a0786135453 SHA-1: 91bed92dc47d440f96abee1f0d2741625a0a4f59 SHA-256: 78d33d0e3d0f693bae5592306a8808a8776863be6623a6fee2b98f82901fbe83
200 Risk Score

Malware Insights

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

The PDF document employs a fake CAPTCHA lure to entice users into clicking a link. This link directs to a known malicious redirector infrastructure, likely serving as a gateway to further malicious content or exploits. The ML classifier also strongly flagged this PDF as malicious, supporting the observed malicious behavior.

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/i-think-someone-hacked-into-my-roblox-account-game-hack In PDF document text
    • http://samavetpharm.com/userfiles/files/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/minecraft-18-9-hacked-client_GM479516143.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/coin-master-hacker-club_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/how-to-change-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/promo-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/roblox-speed-hack_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/roblox-support-free-robux_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/bloxpink-free-robux_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/clients-minecraft_GM479516143.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/minecraft-cracked-client_GM479516143.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_off00005010.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5010 25356 bytes
SHA-256: d807ce8f3597c7575425e2deace3f1bd50c4b37d00c4eed5d8b83ca4c0141c4b
font_01_sfnt_off0000887d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x887D 19524 bytes
SHA-256: d50375b9c878dc31e0a574afa5d1ad2787a509876d9dc9e6a3d1d0f4fe585a7d

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