Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1fca7851fa6218e…

MALICIOUS

PDF

38.7 KB Created: 2021-05-25 00:02:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 3fbf378336fcac02a20df2911adb7964 SHA-1: 1825875130bb93415b434bc1f1cf7fa81b22004a SHA-256: e1fca7851fa6218ece96aeed13ad9333776a3af08ef1001556c2dd3d38436a1b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links and a call-to-action button, all directing users to a malicious redirector infrastructure. The primary lure is for "free game hacks" or "free robux", which is a common social engineering tactic. The ML classifier also flagged this PDF as malicious, increasing confidence in the assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8060

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/479516143/minecraft-redeem-code-free-game-hack In PDF document text
    • http://centr-expert.su/images/coin-master-hack-spins-apk-download_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/free-coins-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000341c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x341C 24520 bytes
SHA-256: 7704d42bd13850a8178fc22285807ce27fa19c69bcc9a87662af18179cf46819
font_01_sfnt_off00006bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BC6 2992 bytes
SHA-256: 1bbfa298dbe5d3a41c401b9355317632bd38f594cc7967314d4dcd577a386485
font_02_sfnt_off00007624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7624 18144 bytes
SHA-256: cc19f71067fb84b21b4f81fd44d646587f5653a8a3073e37b17122851b8ee9dd

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