Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d5ff1a47db4d97…

MALICIOUS

PDF

43.2 KB Created: 2021-05-13 22:51:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ee115c8ee64733d0ccc940a33db774e4 SHA-1: 732526c998269cab948328b4421489ceaa394ac6 SHA-256: b4d5ff1a47db4d97ca89a70fcac9ccb4d860f2492e75810434e0f3d93de01c2a
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to lure users into clicking on game-related cheats and free currency generators. These links point to redirectors and a large number of other PDFs hosted on dcmetroapp.com, indicating a link farm designed to drive traffic to potentially malicious sites. The ML classifier also strongly flagged this PDF as malicious.

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/406889139/coin-master-free-spin-links-december-30-2021-game-hack In PDF document text
    • http://dcmetroapp.com/images/coin-master-links-for-today_GM406889139.pdfIn PDF document text
    • http://dcmetroapp.com/images/coin-master_GM406889139.pdfIn PDF document text
    • http://dcmetroapp.com/images/how-to-hack-coin-master-game-ios_GM406889139.pdfIn PDF document text
    • http://dcmetroapp.com/images/coin-master-spin-link-free-download_GM406889139.pdfIn PDF document text
    • http://dcmetroapp.com/images/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • http://dcmetroapp.com/images/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://dcmetroapp.com/images/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
    • http://dcmetroapp.com/images/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://dcmetroapp.com/images/lastrick-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://dcmetroapp.com/images/clients-minecraft_GM479516143.pdfIn PDF document text
    • http://dcmetroapp.com/images/how-to-get-minecraft-coins-for-free_GM479516143.pdfIn PDF document text
    • http://dcmetroapp.com/images/coin-master-collect-today-free-spin_GM406889139.pdfIn PDF document text
    • http://dcmetroapp.com/images/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://dcmetroapp.com/images/mcpe-master-coins-hack-download_GM406889139.pdfIn PDF document text
    • http://dcmetroapp.com/images/roblox-rules_GM431946152.pdfIn PDF document text
    • http://dcmetroapp.com/images/how-to-get-free-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • http://dcmetroapp.com/images/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://dcmetroapp.com/images/download-coin-master-hack-tool-v1-9_GM406889139.pdfIn PDF document text
    • http://dcmetroapp.com/images/cpbildco-robux_GM431946152.pdfIn PDF document text
    • http://dcmetroapp.com/images/coin-master-rewards-free-spins_GM406889139.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_off00004a4a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A4A 25072 bytes
SHA-256: 10b02a7ec2220732d748b7f55fd81e7b624113b1ce47aaaa854102a2630c3733
font_01_sfnt_off000083e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83E5 19216 bytes
SHA-256: 1dbe36d510364522962f6a70e6f7eef96e8f8e931686e1b7e724a642dc91dfe1

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