Malicious PDF — malware analysis report

Static analysis result for SHA-256 54181e52d8eafc2a…

MALICIOUS

PDF

32.6 KB Created: 2021-07-19 20:04:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 69561298bf88500e889435060115e401 SHA-1: 95d734e5b9d55129d2121e133bf9883aea7c9a34 SHA-256: 54181e52d8eafc2a6940f0d2a032efcd5b05bc9fe5f56dd9ddc9523e67d4da44
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to malicious redirectors, specifically advertising 'free coins and spins' for games, which is a common lure for phishing or malware distribution. The document body explicitly mentions 'CLICK HERE TO ACCESS COIN MASTER GENERATOR', reinforcing the deceptive nature of the content. While no scripts were directly extracted, the PDF structure and embedded URLs strongly indicate an attempt to redirect the user to malicious sites, likely for further payload delivery or credential harvesting.

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/406889139/free-coins-and-spins-coin-master-game-hack In PDF document text
    • https://brusivojimi.com/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://brusivojimi.com/images/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • https://brusivojimi.com/images/minecraft-noob-vs-pro-vs-hacker-vs-god_GM479516143.pdfIn PDF document text
    • https://brusivojimi.com/images/free-tiktok-likes-trial_GM835599320.pdfIn PDF document text
    • https://brusivojimi.com/images/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://brusivojimi.com/images/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://brusivojimi.com/images/is-minecraft-free-on-ps4_GM479516143.pdfIn PDF document text
    • https://brusivojimi.com/images/free-robux-scams_GM431946152.pdfIn PDF document text
    • https://brusivojimi.com/images/minecraft-pe-015-0-apk-free-download_GM479516143.pdfIn PDF document text
    • https://brusivojimi.com/images/free-robux-pastebin_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_off00002b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B5C 22756 bytes
SHA-256: 1fab6cc932fbedbeba5654182bee137d1a6b8658202e9e1c8a2c3776752252f7
font_01_sfnt_off00005e3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E3A 18060 bytes
SHA-256: f1068137021f01f6b5cc3550273fdf5362b49e27ffe305b66dd7920a08d48120

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