Malicious PDF — malware analysis report

Static analysis result for SHA-256 45f2ce037aa1f093…

MALICIOUS

PDF

34.4 KB Created: 2021-07-05 20:51:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c9c6af5a9dfec39dba7d18c228aa5ed3 SHA-1: 3e58a7522832eb3bd0610ae5ad6753c22548a741 SHA-256: 45f2ce037aa1f0933a30a321c1d1df797c30589f0b45536a27b22a05bcd74b58
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free game currency and hacks to entice users. It contains numerous links to redirector domains and a link farm of other PDFs, many of which are SEO-optimized for malicious purposes. The primary redirector URL is http://netcdn.tw/app/406889139/free-spin-app-for-coin-master-game-hack, which likely leads to further malicious content or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/free-spin-app-for-coin-master-game-hack In PDF document text
    • http://lib.smklabor.sch.id/repository/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-card-collection-hack-2021_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/real-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/hacked-roblox-accounts-list_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-500-tiktok-likes_GM835599320.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/como-tener-hacks-en-roblox-adopt-me_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-gift-card-roblox-giverway_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/promo-codes-for-free-stuff-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-free-robux-unpatchable_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-minecraft-mods-for-pc_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-jump-fly-hack_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-do-u-get-free-builders-club-on-roblox_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_off0000305c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x305C 23064 bytes
SHA-256: 4afed002b4bb2028d12c9ceecf99d6cbc1d99003066ba0659609f86e94ef8b3f
font_01_sfnt_off00006436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6436 18176 bytes
SHA-256: 1738a9f57d3e4d23f42eb341396c69ec63b4fe973af11c87a8c9f0948a11dc55

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