Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f11427ebed24a45…

MALICIOUS

PDF

37.9 KB Created: 2021-05-23 19:13:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 86ab61a23b28528a382e258a8e6d13ec SHA-1: ef3f76176c0497efad91b4a4b4be44b9fc7822a0 SHA-256: 8f11427ebed24a457d5c75a8268de795fd5b1484e109700e3cfe5b1a273fbec2
170 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains multiple lures, including a fake invoice and a 'free generator / game hack' link, designed to trick the user into clicking. The primary malicious URL identified is https://netcdn.xyz/app/479516143/minecraft-free-android-game-hack, which is likely a redirector to a malicious payload or phishing page. The document also contains embedded links to other potentially malicious PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9407

Heuristics 7

  • 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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-free-android-game-hack PDF link annotation
    • http://www.riverkennet.org/uploads/files/files/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/robux-come_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/roblox-login-hack_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/how-to-get-free-robux-no-verification_GM431946152.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_002_off000038fe.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x38FE 25712 bytes
SHA-256: 1abf4fc11f8a6badb516995c032c64d117d22f576bceee84145a1f3f075eb28c
font_01_sfnt_off00007417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7417 17884 bytes
SHA-256: 82c3baf37781722f94369c3593b69e30ff14556e6fd52427afe75c94c9d4ce60

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