Malicious PDF — malware analysis report

Static analysis result for SHA-256 90dbb535d9f85c77…

MALICIOUS

PDF

41.8 KB Created: 2021-05-17 11:46:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4269fd728baf74c2c3f7fba49c70c7ec SHA-1: 09826d5703fc8fb6aa8ffab35900d8adf8b7faa7 SHA-256: 90dbb535d9f85c77530c2ed9e5c25d5c64ea7dd72104c31c3857d4c8d47455a1
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of free game currency and hacks to entice users. It contains numerous links to external PDF files, forming a link farm, and also directs users to a malicious redirector at `https://netcdn.xyz/app/406889139/coin-master-link-spin-game-hack`. The document body, though partially corrupted, contains references to these lures and the authoring application `wkhtmltopdf`, suggesting it was generated programmatically for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 https://netcdn.xyz/app/406889139/coin-master-link-spin-game-hack In PDF document text
    • http://parafia-nspj-lebork.pl/images/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://parafia-nspj-lebork.pl/images/robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://parafia-nspj-lebork.pl/images/how-to-earn-robux-fast_GM431946152.pdfIn PDF document text
    • http://parafia-nspj-lebork.pl/images/coin-master-free-spin-whatsapp-group_GM406889139.pdfIn PDF document text
    • http://parafia-nspj-lebork.pl/images/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://parafia-nspj-lebork.pl/images/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • http://parafia-nspj-lebork.pl/images/coin-master-free-spin-game_GM406889139.pdfIn PDF document text
    • http://parafia-nspj-lebork.pl/images/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://parafia-nspj-lebork.pl/images/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://parafia-nspj-lebork.pl/images/minecraft-thumbnail-maker-free_GM479516143.pdfIn PDF document text
    • http://parafia-nspj-lebork.pl/images/microsoft-roblox_GM431946152.pdfIn PDF document text
    • http://parafia-nspj-lebork.pl/images/download-coin-master-apk-hacked_GM406889139.pdfIn PDF document text
    • http://parafia-nspj-lebork.pl/images/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://parafia-nspj-lebork.pl/images/coin-master-on-facebook_GM406889139.pdfIn PDF document text
    • http://parafia-nspj-lebork.pl/images/wurst-18_GM479516143.pdfIn PDF document text
    • http://parafia-nspj-lebork.pl/images/robux-codes-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://parafia-nspj-lebork.pl/images/how-to-get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://parafia-nspj-lebork.pl/images/coin-master-spin-link-today_GM406889139.pdfIn PDF document text
    • http://parafia-nspj-lebork.pl/images/how-to-hack-coin-master-in-pc_GM406889139.pdfIn PDF document text
    • http://parafia-nspj-lebork.pl/images/roblox-robux-hack_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_003_off000047bb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47BB 25220 bytes
SHA-256: 60469357d789b21744bd13f0c724a69aa29b54a32b853086d4fa312796fceb66
font_01_sfnt_off00008236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8236 17892 bytes
SHA-256: 7aa3b039b4dd2eaa3c78c28a8976d594c7bc5201e2dd003047650d51ef6c46d2

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