Malicious PDF — malware analysis report

Static analysis result for SHA-256 a06ec6f837306072…

MALICIOUS

PDF

35.3 KB Created: 2021-07-01 21:59:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f5dfc38b782f9c4fdb3d0a4c80fea855 SHA-1: 6bab2c1af199b0903e833a7536c731c1365ec8c4 SHA-256: a06ec6f837306072ac561ea28c25f25bbb20513232621dd724134ef8d690de18
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.co/app/431946152/roblox-kostenlos-robux-hacken-ohne-eine-app-zu-downloaden-game-hack PDF link annotation
    • http://foo.com.tw/files/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/hack-for-texting-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/roblox-online-hack-tool-no-survey_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/when-was-minecraft-free_GM479516143.pdfIn PDF document text
    • http://foo.com.tw/files/best-site-for-free-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/minecraft-tiktok-hacks_GM479516143.pdfIn PDF document text
    • http://foo.com.tw/files/robux-free-com_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/hack-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/free-helmets-roblox_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/thomas-roblox-free-games_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-club-hack_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/roblox-how-to-hack-welcome-to-roblox-building_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/minecraft-pe-hacked-client-download_GM479516143.pdfIn PDF document text
    • http://foo.com.tw/files/roblox-exploit-download_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000300b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x300B 22552 bytes
SHA-256: 358958bfbc52d885c7ed2ade9c565636cc1739299141ef7e217d2885ebcde2a2
font_01_sfnt_off00006236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6236 19960 bytes
SHA-256: 6a1b1e1da1bd74c6d38371b0d6f279d5d4a53f86986edcdbd847fedc516d163d

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