Malicious PDF — malware analysis report

Static analysis result for SHA-256 a43ac369bd0f05c9…

MALICIOUS

PDF

47.7 KB Created: 2021-06-08 18:07:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 51ab0d6c26f693413b2a5a81ef107516 SHA-1: 99ce57e49c9846045c9f24fcdaca6693736bb45f SHA-256: a43ac369bd0f05c9ec3ef4914b49d3092c3d847e010e960539f7978ec9b7d077
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.tw/app/431946152/roblox-shirt-girl-free-game-hack PDF link annotation
    • http://lib.smklabor.sch.id/repository/www-robux_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-spin-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/claire-free-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/need-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/fb-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/get-me-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-make-clothes-on-roblox-free_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-spins-coin-master-links-no-human-verification_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/hacker-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-free-spins-2021-haktuts_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-free-cards-sets-for-coin-master_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_off00005097.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5097 25372 bytes
SHA-256: 4c670e3a792918d5af92fc5e178c1e6e4b7f232f87efe7c680f1c813e442dc57
font_01_sfnt_off00008a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A90 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off000097a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97A2 18340 bytes
SHA-256: 970ebaceddc03a5fc7ddc00f8854e294dacd59ed824fa1107572270b7bdefc75

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