Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c4fb06004320e74…

MALICIOUS

PDF

37.8 KB Created: 2021-05-20 23:03:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 4ebe7dd65ddf90c79d1e2a95093795cc SHA-1: 65f4ebc995a7d78be3c990a71fe0c99f17a0f80f SHA-256: 5c4fb06004320e7494ff7e65a97329b084342a3d6aa2a28503858b07c8ffe6f5
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to malicious redirectors, specifically advertising "free Robux" and "game hacks" to lure victims. It also displays a fake CAPTCHA, a common tactic to trick users into interacting with malicious content. The ML classifier also flagged this PDF as malicious, increasing confidence in its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

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-please-game-hack In PDF document text
    • https://www.originscollective.com/uploaded_files/userfiles/files/tiktok-free-fans-and-followers_GM835599320.pdfIn PDF document text
    • https://www.originscollective.com/uploaded_files/userfiles/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.originscollective.com/uploaded_files/userfiles/files/free-robux-games_GM431946152.pdfIn PDF document text
    • https://www.originscollective.com/uploaded_files/userfiles/files/how-to-get-more-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.originscollective.com/uploaded_files/userfiles/files/roblox-robux-generator_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_002_off000032f3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32F3 27432 bytes
SHA-256: ad86291532b8ed98beceec6c188dc3fc17ce41cdb5e60e599c84a94ad7d1eaa7
font_01_sfnt_off000071dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71DD 18472 bytes
SHA-256: a4143b220e35e332e52efa777ecf598d1a164c1d6c5ab1887881bf2674d2e637

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