Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a8485cdf97aee5…

MALICIOUS

PDF

42.0 KB Created: 2021-05-15 09:57:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 2f565071c1e4489daacaaeb629f95fba SHA-1: ec32c9674900bccb87a57fbd59926c472ed8d8e1 SHA-256: 28a8485cdf97aee5d919fbc47f33907f3e31b7f879a19ec1148830cb2f595da9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure for game-related cheats and currency, directing users to a malicious redirector. The document contains multiple embedded URLs that likely lead to further malicious content or downloads. The ML classifier strongly indicated maliciousness, and the presence of redirector links confirms a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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-free-spins-link-download-free-game-hack In PDF document text
    • http://samavetpharm.com/userfiles/files/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/minecraft-esp_GM479516143.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/free-robux-meme_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/how-to-get-free-followers-on-roblox_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/free-script-executor-roblox_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/gold-card-coin-master-free_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/coin-master-hack-without-verification-code-2021_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/hack-coin-master-mod-apk_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/roblox-com-r_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/card-hack-in-coin-master_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/minecraft-java-hacks_GM479516143.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/robux-online_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/free-robux-games_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_off000049d7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49D7 24160 bytes
SHA-256: 3a11bf72e6e163fa5684a16032606b1d13b48bf0be8c9225291f770356ef589d
font_01_sfnt_off000080c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80C5 18636 bytes
SHA-256: e0ee4d28e9fbd90893640acb023fdb3433a7d18e360fd79b0a1965f7934d0c46

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