Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a1ee6ff795ec13a…

MALICIOUS

PDF

47.8 KB Created: 2021-06-13 18:39:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 668b3e789ead7d3cc11ac544e639c824 SHA-1: 5f3d42353820f9e942c5a6c94da23d7493f185d8 SHA-256: 2a1ee6ff795ec13a315d24b54b9c19a140403849cd17edc116012eaf3a96a43e
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a fake CAPTCHA lure and a large number of external links, suggesting a phishing or scam attempt. The ML classifier also flagged this PDF as malicious. While no scripts were directly extracted, the presence of numerous SEO-optimized links points towards a potential drive-by download or redirection to a malicious site, possibly leveraging JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/how-to-get-free-duffel-bag-jailbreak-roblox-game-hack PDF link annotation
    • http://berntfoto.dk/images/how-to-get-free-robux-no-scams-no-hacks_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://berntfoto.dk/images/get-more-robux_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/dowload-roblox-for-pc-free_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/coin-master-hack-tool-v1-9-download_GM406889139.pdfIn PDF document text
    • http://berntfoto.dk/images/free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://berntfoto.dk/images/donttazemebro-roblox-person-hes-a-hacker_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/roblox-free-no-download_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/coin-master-fun-free-spins_GM406889139.pdfIn PDF document text
    • http://berntfoto.dk/images/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://berntfoto.dk/images/how-to-get-free-skins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://berntfoto.dk/images/coin-master-freebies_GM406889139.pdfIn PDF document text
    • http://berntfoto.dk/images/tiktok-free-views-and-likes_GM835599320.pdfIn PDF document text
    • http://berntfoto.dk/images/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://berntfoto.dk/images/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/how-to-get-free-followers-on-roblox_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/master-coin-free-spin-daily_GM406889139.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_003_off00004a2a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A2A 28820 bytes
SHA-256: 71c374672fb9ea8254782adb053f29c2d0f1238102bfdeeee3fb717d1bf38c20
font_01_sfnt_off00008b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B39 2852 bytes
SHA-256: e9630f3bb738ae3bc329a423cf069c8035d70ce2227e3557c42815f85ad3284f
font_02_sfnt_off000094fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94FB 19496 bytes
SHA-256: dea8a20ba49a30c83185e00b0b3848ab1eb5b999578ed87060cc22565176ce3d

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