Malicious PDF — malware analysis report

Static analysis result for SHA-256 99eb95441f5ab19c…

MALICIOUS

PDF

46.9 KB Created: 2021-05-14 07:00:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 51a7f8a9319384fba00b2795d0dd3485 SHA-1: e0028a2c993249b78d1324bc7086b43bfc52c8bf SHA-256: 99eb95441f5ab19cc00e9ccfa12b265e8047fdd91ce7009dcebe4680ed9f9a42
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external sites, many of which are identified as malicious redirectors or part of a link farm. The document body and extracted URLs suggest a lure for game hacks and free spins, aiming to redirect users to potentially harmful content. The presence of multiple redirector links and the ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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/406889139/100-free-spins-for-coin-master-2021-game-hack In PDF document text
    • http://agritrade-ukraine.com/images/www-roblox-com-robux_GM431946152.pdfIn PDF document text
    • http://agritrade-ukraine.com/images/robux-generator-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://agritrade-ukraine.com/images/coin-master-game-hack-app_GM406889139.pdfIn PDF document text
    • http://agritrade-ukraine.com/images/ac-market-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://agritrade-ukraine.com/images/coin-master-hack-online-generator_GM406889139.pdfIn PDF document text
    • http://agritrade-ukraine.com/images/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://agritrade-ukraine.com/images/coin-master-hack-trick-2021_GM406889139.pdfIn PDF document text
    • http://agritrade-ukraine.com/images/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • http://agritrade-ukraine.com/images/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://agritrade-ukraine.com/images/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://agritrade-ukraine.com/images/minecraft-on-computer-free_GM479516143.pdfIn PDF document text
    • http://agritrade-ukraine.com/images/all-free-items-in-roblox_GM431946152.pdfIn PDF document text
    • http://agritrade-ukraine.com/images/coin-master-jackpot-madness-hack_GM406889139.pdfIn PDF document text
    • http://agritrade-ukraine.com/images/aternos-free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://agritrade-ukraine.com/images/free-minecraft-bedrock-server-hosting_GM479516143.pdfIn PDF document text
    • http://agritrade-ukraine.com/images/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • http://agritrade-ukraine.com/images/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • http://agritrade-ukraine.com/images/free-pe_GM479516143.pdfIn PDF document text
    • http://agritrade-ukraine.com/images/robloxbux-us-generator_GM431946152.pdfIn PDF document text
    • http://agritrade-ukraine.com/images/minecraft-client-download_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004d6e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D6E 26280 bytes
SHA-256: e28d7f3e5a89298133079305b77d1207cbda7689c541f9a65c63042cf40c48a1
font_01_sfnt_off000089ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89CE 3400 bytes
SHA-256: 4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07
font_02_sfnt_off000094f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94F7 18288 bytes
SHA-256: 7a7785de19adfa5a65cd79b10bfe31691e1cdc7f9f712964e30bbfe58da4eef2

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