Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc72dee9b2e16d8e…

MALICIOUS

PDF

46.9 KB Created: 2021-06-04 02:50:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 897d995852fe012bdc39ad89ff334ec1 SHA-1: 32bdea233c2e9b4a6f1c591a1b0af49ff923dc64 SHA-256: bc72dee9b2e16d8e403be0c89de6231f2e9b89efa462b7d931a5d664def2e674
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. 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 0.9769

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.online/app/406889139/what-is-coin-master-app-game-hack PDF link annotation
    • http://digilib.iailm.ac.id/repository/where-to-get-robux_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/pokemon-go-free-pokecoins-no-human-verification_GM1094591345.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/roblox-online-free-no-download_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/free-spins-coin-master-without-completing-offers_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/coin-master-free-spins-generator-no-human-verification_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/coin-master-free-spins-link-2021-app_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/coin-master-free-spins-link-download-for-iphone_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/roblox-free-rubox_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/rbxdemon_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/free-robux-today_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/coin-master-mod-apk-latest-version-free-download_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/free-robux-no-verification-required_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/coin-master-hacker-club_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/free-spins-coin-master-november-2021_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/coin-master-free-spin-and-coin-link-haktuts-hacking-news_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050e1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50E1 23844 bytes
SHA-256: 1b0ed54a0f9a5bf33829c5210562ab26388c07bc5ca98adbff6ec5c1f3ebf3c2
font_01_sfnt_off00008740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8740 4084 bytes
SHA-256: 5a0af62b1ef6be10dd4b715f800ff405bb50c1d088dd02e15c3313f016fa5b7e
font_02_sfnt_off000094fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94FE 18088 bytes
SHA-256: d458b9181796172f6a95431c592cab6eb4647d9573b1e4001beddfae91ee5885

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