Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f8c52fd26d8672e…

MALICIOUS

PDF

42.2 KB Created: 2021-05-11 16:31:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3f73b8695a20fd62a28a03eb70cdcb9b SHA-1: 2377879978506231e3bf2fd736a1126724fe701d SHA-256: 4f8c52fd26d8672eadea0874908f6dafe837f39ca7de0ae3abee8ec6929667ea
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/coinmaster-spin-ml-free-game-hack PDF link annotation
    • http://www.yaringhospital.go.th/UserFiles/File/coin-master-hack-review_GM406889139.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/how-to-get-free-hats-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/how-to-watch-ads-for-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/coin-master-tool-hack_GM406889139.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/coin-master-new-cards-hack_GM406889139.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/minecraft-18-9-hacked-client_GM479516143.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/free-coins-coin-master-today_GM406889139.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/comapp-trekfree-coin-spindaily-link-master_GM406889139.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/how-to-sue-roblox_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/rbx-robux_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/minecraft-hack-client-18-9_GM479516143.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/free-minecraft-account-list_GM479516143.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/gamesofficenet-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/coin-master-free-spins-twitter_GM406889139.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/hack-coin-master-8-ball-pool_GM406889139.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/free-robux-site_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/official-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/wurst-115_GM479516143.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_off00004991.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4991 25072 bytes
SHA-256: 052fe41cfef7708a0a02b07fc9b0a93ec02b74aef8c65c457d610ce35d9e38eb
font_01_sfnt_off00008306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8306 18220 bytes
SHA-256: 650e8f71a1b9292b8308c8990560b3515b162e3aa2d6bcbd8521e639c6c382b1

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