Malicious PDF — malware analysis report

Static analysis result for SHA-256 e173ad06cddc0d21…

MALICIOUS

PDF

36.9 KB Created: 2021-05-21 14:18:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 42f5ac75f9f828244074be81ea5b8004 SHA-1: bd148927ff36151f9067290023017fb36a3e44a1 SHA-256: e173ad06cddc0d21fcf3e8584a8097841d21dfe69669760502b9b8d8fd9a9f5f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document uses a lure related to 'Free Robux Generator' and includes a call-to-action to download, which is a common tactic for phishing or malware distribution. It contains multiple embedded URLs pointing to redirector infrastructure, ultimately leading to a malicious site. The ML classifier also flagged this PDF as malicious.

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/free-robux-generator-no-verification-game-hack In PDF document text
    • https://uofk.edu/images/robuxmatch-com-free-robux_GM431946152.pdfIn PDF document text
    • https://uofk.edu/images/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://uofk.edu/images/is-coin-master-hacks-safe_GM406889139.pdfIn PDF document text
    • https://uofk.edu/images/how-to-make-a-group-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://uofk.edu/images/minecraft-free-download-android-apk-014-0_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_002_off0000324a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x324A 25568 bytes
SHA-256: d08ddc4490bbdca9d4ebda40955aeba0b6b4228e7b29afba76b773a771e096f3
font_01_sfnt_off00006df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DF9 18600 bytes
SHA-256: fd611ad94f1c5362e5936d61a0ca6686a852f181e3b69dadbb107f1a26b259f7

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