Malicious PDF — malware analysis report

Static analysis result for SHA-256 628d287bac7bef8d…

MALICIOUS

PDF

36.9 KB Created: 2021-05-20 15:23:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e7488c51a1287c8f5b45529c1d172d73 SHA-1: a420fe91ca144061e96325091fa3e854df2c3cf2 SHA-256: 628d287bac7bef8d1c414fd8cfd87f7f0a57c47cea1a9574abf743f26cf4c954
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector domains, specifically advertising 'free Robux' or game hacks, which is a common lure for phishing or malware distribution. The ML classifier also flagged this PDF as malicious. The embedded links likely lead to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

Heuristics 4

  • 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.
  • 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/how-to-get-free-robux-without-verifying-2021-game-hack In PDF document text
    • http://bgnails.nl/images/how-to-gain-more-spins-on-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://bgnails.nl/images/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/roblox-hacks-and-cheats_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/latest-free-spin-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://bgnails.nl/images/hack-my-game-xyz-coin-master_GM406889139.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_off0000331b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x331B 24400 bytes
SHA-256: c6d7a1db83cb4f52a05fa676112e3499a56e17f822ca17f81cbabd416bf2313c
font_01_sfnt_off00006a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A37 19772 bytes
SHA-256: 854662d4ed02eaea1b0a0020fc7ac25fa5b331288bf96b43491be4028b138ed1

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