Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9e95fccdb7b63e7…

MALICIOUS

PDF

34.7 KB Created: 2021-07-04 13:07:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0f570ff76afa49aa8638901b598b9999 SHA-1: d5c70a768d2f744dcb60dc300bca0a7af17865c1 SHA-256: b9e95fccdb7b63e7ce8918d2192f077b7b15747f5fecf76c2a10c8b653e5a7e6
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-mod-game-hack PDF link annotation
    • https://knj.com.tw/image/data/files/roblox-free-play-no-download_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/how-to-make-a-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/pokemon-go-five-free-raid-passes_GM1094591345.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/minecraft-windows-10-free-trial_GM479516143.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/how-to-get-free-robux-without-human-verification-on-android_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/irobux-com-redeem_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/coin-master-free-cards-hack_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/cheat-roblox-csgo_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/free-robux-easy_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/hack-roblox-pc-sur-jailbreak_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/minecraft-java-edition-key-free_GM479516143.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/coin-master-free-gold_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/how-to-change-your-roblox-username-for-free_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
font_00_sfnt_off0000333f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x333F 22716 bytes
SHA-256: ea21799e506a4e0c719dca5c134968fabe3fbc236c21f3a1b982549c0a9d078e
font_01_sfnt_off000065d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65D9 18008 bytes
SHA-256: 9b1b8022fecd0e698345aa4518e5e5ceb9dfed4ff19bb9e19d156964a7983e20

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