Malicious PDF — malware analysis report

Static analysis result for SHA-256 0141381ee5071345…

MALICIOUS

PDF

41.8 KB Created: 2021-05-16 21:34:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3a357c0195c046af08e7018d6f69251a SHA-1: 92eb94911b68de8170b334206849c90b2f253ba7 SHA-256: 0141381ee507134514ffaaad89d600f4654a4f40dc75d9640959a29c5494caac
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/479516143/minecraft-hacks-list-game-hack PDF link annotation
    • http://www.buapit.ac.th/UserFiles/File/coin-master-free-box_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/op-rewards-robux_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/apps-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/wurst-minecraft_GM479516143.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/how-to-become-a-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/hack-coin-master-1_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/coin-master-el-tiger-card-free_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/hack-coin-master-android-game_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/coin-master-hack-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_003_off00004a6f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A6F 25048 bytes
SHA-256: 104e2212208b8a29f0c2ba6f531be009c54d8d8c574afc5e4fc6cafafa954728
font_01_sfnt_off000082e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82E3 17740 bytes
SHA-256: c2e082955acc44a54c2cd6792e97aac33f079296fe9f17b7b430410190c0edcd

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