Malicious PDF — malware analysis report

Static analysis result for SHA-256 753f8dd525c18965…

MALICIOUS

PDF

34.0 KB Created: 2021-07-05 12:46:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fd098081e4bfd2e2cf21ea203db9c6ec SHA-1: 0ef048223f4def5e436520c05569e94f72ca2137 SHA-256: 753f8dd525c189651ca9dd5ff99d3cb7f562e739a66af5a8526d5cd94d39b15f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, with a primary focus on a 'free generator / game hack' lure. Heuristics indicate that the primary URL, http://netcdn.tw/app/406889139/coin-master-free-foxy-food-game-hack, is part of a malicious redirector infrastructure. The document body, though partially corrupted, reinforces this theme with similar game-related keywords and URLs. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to potentially harmful content.

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 http://netcdn.tw/app/406889139/coin-master-free-foxy-food-game-hack In PDF document text
    • http://www.opac.stieimalang.ac.id/repository/roblox-freebies-hack_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/coin-master-time-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/catalog-in-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/cipherv3-roblox-exploit-rocky-hacks-and-more_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/how-to-get-real-robux_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/how-to-get-free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/how-to-be-vip-in-free-paint-roblox_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/earn-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/adopt-me-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/coin-master-hack-apk-link_GM406889139.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/how-to-get-free-snacks-on-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/free-robux-thumbnail_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/coinmaster-links_GM406889139.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/free-robux-promo-codes-december-2021_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/coin-master-jackpot-hack_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/roblox-skywars-fly-hack-2021_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_002_off00002f3e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F3E 22492 bytes
SHA-256: 99889548014b206a08fed53c2786ed4c9e819fb76edebf902332d62083e46fd7
font_01_sfnt_off00006122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6122 18564 bytes
SHA-256: 4e08a9fe38938dbf04ccb9f1ad2aa5bec9d413f8e0a851b44050773223700f32

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