Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3fe84825b16c775…

MALICIOUS

PDF

34.6 KB Created: 2021-06-19 04:34:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: d5ba9923645cf5c3936373cd1170c515 SHA-1: 092454c0274c892e53b9eaa36531374d1e9c797c SHA-256: d3fe84825b16c7756d69c694269c63390ee0b9a740318c1dd9b311607797018b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links that redirect to known malicious infrastructure, specifically advertising 'free generators' or 'game hacks'. The ML classifier also flagged this PDF as malicious. The primary lure appears to be related to free game items or currency, a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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 http://netcdn.co/app/431946152/free-funny-roblox-shirt-game-hack In PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/robuxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/free-spins-coin-master-without-survey_GM406889139.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/best-free-spin-app-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/free-robux-2021-no-survey_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/mcpe-master-hack-coins_GM406889139.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/hacker-minecraft-song_GM479516143.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/get-free-spins-on-coin-master-links_GM406889139.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/how-to-get-free-robux-hack-inspect-element_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/coin-master-hack-spin-generator-tool_GM406889139.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/hack-roblox-players_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/robux-offers_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/coin-master-hack-apk-android_GM406889139.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/minecraft-114-4-download_GM479516143.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/free-robux-cards_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/roblox-cheat-engine-values_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/how-to-hack-back-your-roblox-account_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/minecraft-hack-2021_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
font_00_sfnt_off00002ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FF7 22200 bytes
SHA-256: 424d1ccb9690537321610144bbb69a9f4ec8f8542088d217b209f1e63f715396
font_01_sfnt_off00006159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6159 19360 bytes
SHA-256: 807d44bb237c6f63549957f82276141031cedab3a5035165a75c12836e661c8b

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