Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cd1b031274a103c…

MALICIOUS

PDF

35.1 KB Created: 2021-05-22 15:34:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: acac1bb15a584d5a21c966f33848a198 SHA-1: aa7e3bc35e85fa8a2f04703a879f3d0721d4fbbf SHA-256: 8cd1b031274a103ccba2648829ff413492efde84d81ff3cdcc0b01e29444cf89
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector infrastructure, specifically advertising 'free coins and spins' for games, which is a common lure for malicious downloads. The document body explicitly contains a call to action 'CLICK HERE TO ACCESS COIN MASTER GENERATOR ?' and directs users to a suspicious URL. While no scripts were directly extracted, the PDF structure and embedded links strongly suggest a social engineering attack aimed at tricking users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9508

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 https://netcdn.xyz/app/406889139/free-coins-and-spins-coin-master-game-hack In PDF document text
    • http://www.flotom.at/images/is-minecraft-earth-free_GM479516143.pdfIn PDF document text
    • http://www.flotom.at/images/coin-master-free-spins-daily-link-game-mod_GM406889139.pdfIn PDF document text
    • http://www.flotom.at/images/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://www.flotom.at/images/minecraft-xray-hack_GM479516143.pdfIn PDF document text
    • http://www.flotom.at/images/offers-to-get-free-spins-in-coin-master_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_002_off0000324e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x324E 24128 bytes
SHA-256: 11c5c0d65c57d4df675976e4c290c21de8dac79c2a544ad43aad896e77ac11fc
font_01_sfnt_off00006883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6883 18060 bytes
SHA-256: f1068137021f01f6b5cc3550273fdf5362b49e27ffe305b66dd7920a08d48120

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