Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5fc8725c8efdc43…

MALICIOUS

PDF

40.2 KB Created: 2021-05-16 00:46:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 356a0e8892a46ecc14e646f50bc4a000 SHA-1: 6573bb889654f6e6de40caab66b241b6885768ae SHA-256: f5fc8725c8efdc43d77a8a7409028bd85e5d016edfb0ad6d525ad51922d7584c
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to a known malicious URL. The document body also contains the same URL and a call-to-action phrase, reinforcing the phishing attempt. While no scripts were extracted, the embedded URL is the primary indicator of malicious intent, likely leading to a further stage of compromise.

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/new-free-money-links-coin-master-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_off00003638.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3638 24888 bytes
SHA-256: 2c25a11607ec1458ecfa32feb9d45205b85834cc3d9c679a4fba4cfd20923c29
font_01_sfnt_off00006e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E58 4020 bytes
SHA-256: dbaa9c12d07f3632734605f1d5d6dee3ad5af1f57488e46d95dab68b383f08c5
font_02_sfnt_off00007be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BE0 18224 bytes
SHA-256: f61279c4473261222c708140308137155a35f7b52412648030a8269f43a1c894

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