Malicious PDF — malware analysis report

Static analysis result for SHA-256 a205ea7ab815552e…

MALICIOUS

PDF

35.2 KB Created: 2021-06-20 11:46:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: d2423cf8023938b9af0380082fda3d21 SHA-1: cd4d24a1a7d83ea29fb1d276c59534e1cb515fcb SHA-256: a205ea7ab815552e342d6f67e98ae2c4199105bc8ef3d57ecd1307afb2c7d5f0
142 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are presented as 'game hacks' or 'free generators' for popular games like Roblox and Minecraft. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these links, suggesting the document's primary purpose is to drive traffic to these external sites. The ML classifier also strongly flagged this PDF as malicious.

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.co/app/431946152/roblox-phantom-forces-pepsis-aimbot-hack-2021-game-hack PDF link annotation
    • https://www.tiancom.com.tw/upload/files/how-to-hack-in-arsenal_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/how-to-make-a-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/minecraft-pocket-edition-free-apk_GM479516143.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/free-minecraft-realms-to-join_GM479516143.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/coin-master-codes_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/roblox-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/how-can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/roblox-hacks-scythe_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/hacker-scp-roblox_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/coin-master-hack-apk-with-fb-login-2021_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/minecraft-java-edition-free-trial_GM479516143.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/fan-page-coin-master_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/free-minecraft-account-list_GM479516143.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_off00002f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F55 22564 bytes
SHA-256: 26d5bbf8873378d5af0c9b19c5cc5e11590cb139349448073be2455a92eab1d8
font_01_sfnt_off00006177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6177 20204 bytes
SHA-256: f85c6e205bc93298b46481da1ba97772d61054a3fd19def3162079819c7b3fbd

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