Malicious PDF — malware analysis report

Static analysis result for SHA-256 5973154cf1ffb259…

MALICIOUS

PDF

45.8 KB Created: 2021-06-11 03:34:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d8c58ed8d1c16d84b61d861ce1583f82 SHA-1: 6d84491c383a6fb3221a1a03587cd93f29180ddd SHA-256: 5973154cf1ffb2597582a9f4d15a0efe8967ec1dc9baedde7352ffdf35eec45e
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector domains and SEO-optimized PDF files, indicating a lure for users interested in game hacks or free items. The primary redirector URL, https://netcdn.tw/app/431946152/roblox-build-a-boat-hack-nopde-game-hack, is flagged as malicious. The document body, though heavily obfuscated, contains references to game hacks and the same redirector URL, reinforcing the malicious intent. No scripts were extracted, but the PDF structure and embedded links strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/roblox-build-a-boat-hack-nopde-game-hack In PDF document text
    • http://www.sbairs.com/datas/files/get-free-gold-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/coin-master-free-spin-facebook-link_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/minecraft-dungeons-download-free_GM479516143.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/coin-master-link-spin_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/blox-pink-robux-free_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/how-to-get-minecraft-for-free-on-chromebook_GM479516143.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/coin-master-daily-free-cards_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/coin-master-hack-cheat-engine_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-robux-today_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/roblox-com-games-referrer-roblox-player_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/rewards-roblox-com_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/mobihack-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/is-there-an-actual-hack-that-work-for-coin-master_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
stream_004_off0000517d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x517D 27156 bytes
SHA-256: 59993ea12623b5c7918ea41aed3c00926b1a901c300fe67fb5b0ae82d4bbf861
font_01_sfnt_off00008eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EB7 18896 bytes
SHA-256: 5c5567e26fbbffa68b7d92c9393062cbe758cb21b512f57656970ac16fcd2234

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