Malicious PDF — malware analysis report

Static analysis result for SHA-256 d356870367c1fd26…

MALICIOUS

PDF

53.7 KB Created: 2021-06-09 06:15:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 54214a1b92241f44d4b9bafee99e4ca0 SHA-1: 3d622d05f196bdec7ac3afb1245ca979f8bed6b7 SHA-256: d356870367c1fd262199532e8d55e7e054d22959e28341cdcbc96827cc201959
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 0.9636

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.tw/app/431946152/games-you-can-hack-on-roblox-game-hack PDF link annotation
    • http://www.fluidtech.hu/images/coin-master-hack-spins-free_GM406889139.pdfIn PDF document text
    • http://www.fluidtech.hu/images/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/minecraft-diamond-finder-hack_GM479516143.pdfIn PDF document text
    • http://www.fluidtech.hu/images/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.fluidtech.hu/images/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/how-to-get-free-followers-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/how-to-get-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://www.fluidtech.hu/images/coin-master-free-download-for-pc_GM406889139.pdfIn PDF document text
    • http://www.fluidtech.hu/images/how-to-get-free-roblox-on-a-computer_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/how-do-i-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/free-robux-generator-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/give-me-robux_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/is-there-actually-a-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/minecraft-xbox-one-free_GM479516143.pdfIn PDF document text
    • http://www.fluidtech.hu/images/roblox-apk-hack_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/coin-master-app-hacks_GM406889139.pdfIn PDF document text
    • http://www.fluidtech.hu/images/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/how-to-get-free-admin-in-roblox_GM431946152.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_004_off0000539e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x539E 27364 bytes
SHA-256: 490d1251d9145fb1c8f755f16406b7b26c84bfcf01496aa41b340c93e8eb9362
font_01_sfnt_off0000934a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x934A 8252 bytes
SHA-256: 7ebedd6b182173c8e55836cb0d114b2c4a0ac85c96a51b9f0706c935f8415fea
font_02_sfnt_off0000ae5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE5E 18744 bytes
SHA-256: e294d49f85d857f97b8e198113bd33c12ef9d797dcd097784fe8401f86718591

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