Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ff47e05a0e4d85…

MALICIOUS

PDF

37.3 KB Created: 2021-05-24 03:05:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 61b93855acff809bf3b4a1c1aa6d5846 SHA-1: b608c08a2eea99bb6fcc791fb0c6a5b50d781ce4 SHA-256: 27ff47e05a0e4d85bd65e2eef93a6550a45fd1ae158cc9aee495b3eeb3ce2d53
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to a 'Coin Master Free Coins 2021' generator. This link is designed to lure users into downloading potentially malicious content. The document body reinforces this by displaying similar promotional text and the malicious URL.

Machine Learning

  • Nyx PDF Classifier clean score 0.0739

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-coins-2021-game-hack In 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_off00002f92.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F92 29952 bytes
SHA-256: eaa564827572b5805b29ede94288e6658f3c5c5b4b47c13fce63b5a35faf7760
font_01_sfnt_off00007148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7148 18112 bytes
SHA-256: d3290bf375094f68ca2c73f068de3958d05aa7629a05aa779b6fc584462feea2

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