Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ceaca11b3d82e84…

MALICIOUS

PDF

30.8 KB Created: 2021-07-19 07:54:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a5a5cacae40ca75c2651d58420101d11 SHA-1: 92858bb01e961e52fa9f7056f31cb685a2567b55 SHA-256: 4ceaca11b3d82e84ac7ab9bd038f96e424e7fde4c9d958fa1ea3419566998d31
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a redirector infrastructure that promotes a 'coin master free spin ml game hack'. This lure, combined with the presence of embedded URLs and the document's structure suggesting a call-to-action, indicates a phishing or scam attempt. The document likely aims to trick users into downloading further malicious content or visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier clean score 0.0715

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/coin-master-free-spin-ml-game-hack In PDF document text
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/how-to-get-minecraft-for-free_GM479516143.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_002_off00002472.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2472 22936 bytes
SHA-256: 6fe9373fd2668882b1584f313cb8f357939c782461a921655d4ed1729ada8f2e
font_01_sfnt_off0000581f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x581F 17960 bytes
SHA-256: 444b71fec9169bc90a734dd5dd223b39b45661ce510f738c863c1de9395466a1

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