Malicious PDF — malware analysis report

Static analysis result for SHA-256 9572537db2e19067…

MALICIOUS

PDF

29.0 KB Created: 2021-07-18 22:41:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 3e3ce36c65e77120c4b90ac426776f11 SHA-1: 90b34a8dfeacafcd57d303602997ae4a3009dbc7 SHA-256: 9572537db2e19067e75776dde1eb693c0a12fdf39b20ee0210073b22417f433a
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains heuristics indicating it's a lure for game hacks and links to a known malicious redirector. The embedded URL, http://netcdn.tw/app/406889139/how-do-i-get-free-spins-on-coin-master-game-hack, is the primary indicator of malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristics suggest an attempt to redirect the user to a potentially harmful site, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier clean score 0.0570

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 http://netcdn.tw/app/406889139/how-do-i-get-free-spins-on-coin-master-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
font_00_sfnt_off00001e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E6E 22320 bytes
SHA-256: 5296e3785ef895faf31a50fd61173921e09477224a5d66a9674718cc44097d6a
font_01_sfnt_off00004fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FCA 18216 bytes
SHA-256: 7b3dc5054b0587ec41e602859ac4e59ac97ec46c9406b1b4182074b4d7a08153

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