Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d5e405d71a53efc…

MALICIOUS

PDF

45.3 KB Created: 2021-05-13 12:06:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 15933857431ad4b21c6897c7c4ff541e SHA-1: a9fb74d279da7faed6c4e26c4042498c595e3fc3 SHA-256: 0d5e405d71a53efc9b6867ef9b3cc8a714bfbb711dfaf6cf41fdf5dcd7eb803e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and other PDF files, masquerading as game hacks or generators. The ML classifier strongly indicates maliciousness, and the presence of numerous links to potentially harmful content suggests a phishing or scamming attempt. No scripts were extracted, but the document's structure and embedded URLs point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/coin-master-gameplay-game-hack In PDF document text
    • http://autoskola-scp.com/files/free-robux-cards_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/free-minecraft-worlds_GM479516143.pdfIn PDF document text
    • http://autoskola-scp.com/files/roblox-accounts-for-sale-free_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/daily-coin-master-free-spin-apk_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/free-robux-generator_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/coin-master-free-spins-save_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/master-coin-hack-app_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/how-to-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://autoskola-scp.com/files/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/how-many-levels-in-coin-master_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/free-roebucks-no-human-verification_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/coin-master-card-collection-link_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/www-coin-master_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/open-coin-master_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/coin-master-spins-for-free_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/robuxy-com-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_off00004c10.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C10 30760 bytes
SHA-256: 7cc01a68bec15e2ab1a1f27221d8152193cfffa07166e2acf029d604ab21c904
font_01_sfnt_off00008f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F35 18236 bytes
SHA-256: ad3c54622fe5860f441fa157cfd09fdd7391131bf21229add7d3bdfc0c26f4fb

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