Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cb36aacba4e625e…

MALICIOUS

PDF

43.6 KB Created: 2021-05-14 10:07:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b9716aaf153f873cb49308beab2ac051 SHA-1: 9cb8e0c112da5a2b63c87e80d02020ef84c3d251 SHA-256: 3cb36aacba4e625eb730a3ccafb5c1a8c1a663f31ebba4b98f50015417399c88
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to a known malicious redirector infrastructure. The document body and heuristics indicate a lure for 'free generator' or 'game hack' content, which is a common tactic for phishing or malware distribution. The presence of many SEO-optimized PDF links suggests an attempt to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/431946152/can-you-get-free-robux-on-roblox-game-hack In PDF document text
    • http://kkmman.e-learningman1bitung.com/__statics/gudangsoal/files/minecraft-free-online_GM479516143.pdfIn PDF document text
    • http://kkmman.e-learningman1bitung.com/__statics/gudangsoal/files/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://kkmman.e-learningman1bitung.com/__statics/gudangsoal/files/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • http://kkmman.e-learningman1bitung.com/__statics/gudangsoal/files/coin-master-free-spins-cash_GM406889139.pdfIn PDF document text
    • http://kkmman.e-learningman1bitung.com/__statics/gudangsoal/files/coin-master-unlimited-spin-hack-mod-apk_GM406889139.pdfIn PDF document text
    • http://kkmman.e-learningman1bitung.com/__statics/gudangsoal/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://kkmman.e-learningman1bitung.com/__statics/gudangsoal/files/how-to-generate-free-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://kkmman.e-learningman1bitung.com/__statics/gudangsoal/files/free-domain-for-minecraft-server_GM479516143.pdfIn PDF document text
    • http://kkmman.e-learningman1bitung.com/__statics/gudangsoal/files/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://kkmman.e-learningman1bitung.com/__statics/gudangsoal/files/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://kkmman.e-learningman1bitung.com/__statics/gudangsoal/files/minecraft-free-school_GM479516143.pdfIn PDF document text
    • http://kkmman.e-learningman1bitung.com/__statics/gudangsoal/files/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • http://kkmman.e-learningman1bitung.com/__statics/gudangsoal/files/coin-master-hack-online-cheat_GM406889139.pdfIn PDF document text
    • http://kkmman.e-learningman1bitung.com/__statics/gudangsoal/files/robux-website_GM431946152.pdfIn PDF document text
    • http://kkmman.e-learningman1bitung.com/__statics/gudangsoal/files/minecraft-pe-free-download_GM479516143.pdfIn PDF document text
    • http://kkmman.e-learningman1bitung.com/__statics/gudangsoal/files/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://kkmman.e-learningman1bitung.com/__statics/gudangsoal/files/how-to-get-minecraft-for-free-on-ipad_GM479516143.pdfIn PDF document text
    • http://kkmman.e-learningman1bitung.com/__statics/gudangsoal/files/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://kkmman.e-learningman1bitung.com/__statics/gudangsoal/files/hack-coin-master-using-pc_GM406889139.pdfIn PDF document text
    • http://kkmman.e-learningman1bitung.com/__statics/gudangsoal/files/rbl-gg-free-robux_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
stream_003_off00004c65.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C65 25288 bytes
SHA-256: 9b255c921b19d145700b2a2e4c5f6722b77249c47a9810142956160aef956d3a
font_01_sfnt_off00008748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8748 18580 bytes
SHA-256: 0d0c29456045ba8700eeeb9b5d08ef238a74b3c73615dbb1a220be23830403a6

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