Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d5f82369e46701e…

MALICIOUS

PDF

34.3 KB Created: 2021-07-09 19:49:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d6a820e5c0f3e26512ce9507e3158dea SHA-1: 8b0b96a0868ac7590240fdc6bdc360efef5d5cfc SHA-256: 7d5f82369e46701ee36edbdb28f343ca792dfb9f593ce3f6fd83e21f7efad8ea
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and game hack lures, indicating a social engineering attempt to trick users into visiting potentially harmful sites. The document body and embedded URLs strongly suggest a scam related to popular mobile games like Coin Master and Roblox. While no scripts were explicitly extracted, the PDF structure and embedded links are sufficient to infer a malicious intent to redirect users to malicious infrastructure.

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/ear-free-spins-for-coin-master-game-hack In PDF document text
    • http://fobh.net/userfiles/files/free-roblox_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-free-fire_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/roblox-free-login_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-coins-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-free-coins--spins_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/pubg-uc-vn_GM1330123889.pdfIn PDF document text
    • http://fobh.net/userfiles/files/minecraft-java-edition-free-trial_GM479516143.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-to-get-more-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-to-hack-coin-master-ios-2021_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/haktuts-coin-master-free-spin-link-today_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/robux-generator-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/money-roblox-hack-pastebin_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-to-change-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/tiktok-free-to-watch-online_GM835599320.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
font_00_sfnt_off000030d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30D8 22752 bytes
SHA-256: 0d1ea4907a48737cba6745e01f543f4087420dc64a7aa571ff714fb248873dc4
font_01_sfnt_off000063e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63E6 18176 bytes
SHA-256: 8cb6e5092b491550e7b215afb87da4ecb4c91e5b5bb3d5caa4fd4e6f3eb8d81f

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