Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf91b87348957d84…

MALICIOUS

PDF

40.2 KB Created: 2021-05-11 04:06:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 99b6ed1b78acddd88f2c2c3d7ef4ac8d SHA-1: b4a3a8d50688908727469ffb730f3f7875a45b24 SHA-256: bf91b87348957d8439e09e12914f6af3ba7dd190aef809ba5657cddada9adbcb
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains heuristics indicating it's a lure for a game hack generator, with multiple links pointing to a known malicious redirector. The document body, though partially garbled, includes text related to 'Coin Master Free Spins' and a call to action, reinforcing the phishing pretext. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier clean score 0.0128

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/406889139/coin-master-free-spins-deutsch-download-2021-link-game-hack In 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_003_off000036c1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x36C1 24988 bytes
SHA-256: 8845f04c50b642591bfe0eefd7a997b3cb884459b4550aaa47c8c27c9436767b
font_01_sfnt_off00006edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EDB 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off0000788c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x788C 19344 bytes
SHA-256: 2845a3e6ec075e64a55efc9536af757c9c9ea9b8a2b732129eaf0438470dc816

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