Malicious PDF — malware analysis report

Static analysis result for SHA-256 57341a9f69ee3d06…

MALICIOUS

PDF

34.5 KB Created: 2021-07-05 17:24:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 843247fdf6918a1b17a31e46827396ec SHA-1: ebe13ff5f3fd4120308ce3221f51ad3049f171b1 SHA-256: 57341a9f69ee3d0623c2b4837f44f0ad92ef6ca703f67513d2dda5ba29ce6765
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector at http://netcdn.tw/app/406889139/coin-master-hack-spins-game-hack. The document body and embedded links suggest a lure for game hacks and free currency, likely a phishing or scam attempt. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

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-hack-spins-game-hack In PDF document text
    • http://library.forda-mof.org/katalog/repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/do-roblox-read-hack-reports_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-robux-hck_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/how-to-get-pokecoins-pokemon-go-free_GM1094591345.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/20-free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/get-free-robux-gg_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/robux-hack-download-app_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/best-free-hacked-client_GM479516143.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/coin-master-cards-for-free_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/coin-master-hack-here_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-robux-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/irobux-com-redeem_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/cheat-roblox-building-simulator_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-robux-pc-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/roblox-script-hack_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/map-for-free-robux_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/60-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/coin-master-mod-version-free-download-2021_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_off00003205.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3205 22508 bytes
SHA-256: d235d8a7c3f66e6ff64a5c4e64988d248b52e0f472dce79c939055f6f8241910
font_01_sfnt_off00006461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6461 18180 bytes
SHA-256: 8089ec70024e38c963cd1b8e4fd66f251d2ac35f3e2526171ef4435f22e5a9e0

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