Malicious PDF — malware analysis report

Static analysis result for SHA-256 d42319887dce5f02…

MALICIOUS

PDF

35.7 KB Created: 2021-06-23 04:26:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1af4423abfc618d65276b0a16857940b SHA-1: d3629f68547f1e0d421c226e3c48fc925e88a014 SHA-256: d42319887dce5f0213e701220209ab25fc571d1fff727d5bcdf65cf108734812
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to external websites, including a known malicious redirector at http://netcdn.co/app/406889139/coin-master-hack-android-game-hack. The document body and heuristics indicate a lure for free game hacks and in-game currency, designed to entice users to click these links. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

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/406889139/coin-master-hack-android-game-hack In PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/free-roblox-shirts-girl_GM431946152.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/coin-master-hacks-no-human-verification_GM406889139.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/coin-master-online-hack-tool_GM406889139.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/how-to-get-verified-on-tiktok-for-free-2021_GM835599320.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/minecraft-reach-hack_GM479516143.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/how-to-make-a-minecraft-bedrock-server-for-free_GM479516143.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/is-there-a-safe-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/hacks-for-treasure-quest-on-roblox_GM431946152.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/free-back-accessories-roblox_GM431946152.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/getrobux-now_GM431946152.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/minecraft-hack-download_GM479516143.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/coin-master-apk-hacked-3526_GM406889139.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/tiktok-views-free_GM835599320.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/free-minecraft-domain_GM479516143.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/robux-for-surveys_GM431946152.pdfIn PDF document text
    • http://jarviskeller.co.uk/media/storage/editor/files/coin-master-hack-program_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
font_00_sfnt_off00003639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3639 22792 bytes
SHA-256: a80d11bd370a4dda9f09624713b712d1bea55352859b59560d9d2fd274fcfaf4
font_01_sfnt_off00006958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6958 18180 bytes
SHA-256: f5cbea246cb26881ab0b077849d455766446565632394434fbc585ef7ce09a04

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