Malicious PDF — malware analysis report

Static analysis result for SHA-256 d997c140f3a2bd40…

MALICIOUS

PDF

41.9 KB Created: 2021-05-14 22:05:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d3a3c61e60ac0f666ad65978c01eb129 SHA-1: 609a0b0fb83295251ad0e3790215444502ce9ac5 SHA-256: d997c140f3a2bd40abfddbd5ab0b4522ff19f68f03489c49370f695f578510ff
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document employs a common lure of game hacks and free spins to trick users into clicking malicious links. The document contains a large number of SEO-optimized PDF links hosted on the domain 'ikig.ru', which likely serve as a link farm or redirect to further malicious content. The primary malicious URL identified is 'https://netcdn.xyz/app/406889139/coin-master-daily-spin-link-game-hack'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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-daily-spin-link-game-hack PDF link annotation
    • http://ikig.ru/images/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • http://ikig.ru/images/coin-master-free-spins-link-2021-hack_GM406889139.pdfIn PDF document text
    • http://ikig.ru/images/hacked-roblox-game_GM431946152.pdfIn PDF document text
    • http://ikig.ru/images/roblox-com-r_GM431946152.pdfIn PDF document text
    • http://ikig.ru/images/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • http://ikig.ru/images/coin-master-free-spins-links-2021_GM406889139.pdfIn PDF document text
    • http://ikig.ru/images/coin-master-free-in-app-purchases-jailbreak_GM406889139.pdfIn PDF document text
    • http://ikig.ru/images/coin-master-unlimited-spin-hack_GM406889139.pdfIn PDF document text
    • http://ikig.ru/images/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://ikig.ru/images/coin-master-free-download-for-pc_GM406889139.pdfIn PDF document text
    • http://ikig.ru/images/how-many-levels-are-there-in-coin-master_GM406889139.pdfIn PDF document text
    • http://ikig.ru/images/coin-master-links-for-free-spins_GM406889139.pdfIn PDF document text
    • http://ikig.ru/images/how-to-get-free-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • http://ikig.ru/images/free-coin-master-game_GM406889139.pdfIn PDF document text
    • http://ikig.ru/images/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://ikig.ru/images/how-to-get-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://ikig.ru/images/coin-master-hack-ios-no-verification_GM406889139.pdfIn PDF document text
    • http://ikig.ru/images/download-coin-master-hack-tool-v1-9_GM406889139.pdfIn PDF document text
    • http://ikig.ru/images/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://ikig.ru/images/free-robux-generator_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_off0000494f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x494F 25036 bytes
SHA-256: c031fb0fa2dca7a7b6c0aec5eea7b04f0cbb6d827d8cc247289868c6146b0529
font_01_sfnt_off00008112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8112 18316 bytes
SHA-256: 5f3aa979c0c75b9e9bcded1c8d551e9f9e6ead33f385895e7850a31af22003f0

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