Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c255aef5eaadd16…

MALICIOUS

PDF

32.8 KB Created: 2021-07-20 03:10:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 26ca30ee6210eb56a7c704303b557c68 SHA-1: 34d82db50c3c8f3356bcfb69457fb1f5a49c42a8 SHA-256: 2c255aef5eaadd1615c62d1dbf22220f87dfa1884e0258e55f0ef93735ed9cab
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to redirector infrastructure, masquerading as free game hacks and generators. The primary lure directs users to 'netcdn.tw', which is flagged as malicious. The document body also contains numerous links to 'fs4sms.com', which likely serve as further lures or download locations for malicious payloads. The presence of a download button lure and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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/479516143/minecraft-free-online-game-hack In PDF document text
    • http://fs4sms.com/images/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://fs4sms.com/images/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • http://fs4sms.com/images/how-to-get-verified-on-tiktok-for-free-2021_GM835599320.pdfIn PDF document text
    • http://fs4sms.com/images/free-robux-no-password_GM431946152.pdfIn PDF document text
    • http://fs4sms.com/images/minecraft-free-download-ios_GM479516143.pdfIn PDF document text
    • http://fs4sms.com/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://fs4sms.com/images/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://fs4sms.com/images/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://fs4sms.com/images/how-to-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://fs4sms.com/images/free-robux-gift-card-codes_GM431946152.pdfIn 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_off00002dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DD7 22840 bytes
SHA-256: 07ecf69d1dfcccfa301de6fdad082782b62e19a961d9af2b13493fe220a4fe9d
font_01_sfnt_off00006058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6058 17644 bytes
SHA-256: d3a8b3d8bd2249c6206e1557dca74d08ec9c3b58c2328dc4779a04ae87c22ca2

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