Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fde5e755a68f527…

MALICIOUS

PDF

35.5 KB Created: 2021-07-04 10:18:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 4aa9f02b36a63b2987ef8cc79bae0dbd SHA-1: 9d9e1959602e790f256c71adac1ba9295c1d2c2a SHA-256: 9fde5e755a68f527b1945b6d30af9e51edb7e5c62453218882a8ae8b8ab05993
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a malicious redirector disguised as a 'free generator / game hack' for Coin Master. This lure is intended to trick users into clicking the link, which then likely leads to the download of further malicious content or malware. The presence of multiple links to similar deceptive content reinforces this malicious intent.

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-links-for-today-game-hack In PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/free-robux-master_GM431946152.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/how-to-get-free-robux-inspect_GM431946152.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/free-links-coin-master_GM406889139.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/free-spins-coin-master-app-iphone_GM406889139.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/free-spin-coin-master-online_GM406889139.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/mcpe-116_GM479516143.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/free-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/static-moonactive-net-rewards-2021_GM406889139.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/how-to-get-free-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/roblox-free-robux-games-2021_GM431946152.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/pokemon-go-best-free-outfits_GM1094591345.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/how-to-cheat-in-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/minecraft-free-play-no-download_GM479516143.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/coin-master-free-spin-27_GM406889139.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/coin-master-free-spins-2-5-2021_GM406889139.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/minecraft-free-download-android-apk-014-0_GM479516143.pdfIn PDF document text
    • http://www.thalanghospital.go.th/UserFiles/File/claim-free-spins-coin-master_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
font_00_sfnt_off0000347e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x347E 22748 bytes
SHA-256: 54348e93b1b950b8ff5ee9d6225769b86ce5b9c794f940e589082ce9af14a299
font_01_sfnt_off0000673c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x673C 18524 bytes
SHA-256: 9e2b17a2888e17d335209aec35c43d796348b949677bc7770edd394e7e2bb40c

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