Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d1b4f46f22a1f25…

MALICIOUS

PDF

45.4 KB Created: 2020-08-31 16:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05aaac546369623bae74a7d24316ab24 SHA-1: f99bdcca4126df7f6fa50eae4ed91c4c17ff151c SHA-256: 4d1b4f46f22a1f25648abd96d8ff9f8ebb5666893f1f96003cabea11c764e4ff
150 Risk Score

Malware Insights

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

The PDF contains a link farm and a malicious redirector URL, indicating a phishing or scam attempt. The document body, though heavily obfuscated, contains text related to 'Epigeum research integrity quiz answers' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ttraff.link/wix?keyword=epigeum+research+integrity+quiz+answers
    • https://static.usrfiles.com/ugd/ab63e3_e61ebb3592bd416caf9cc3c9ecbd228e.pdf
    • https://static.usrfiles.com/ugd/b8c837_928da8534db641c1a63a7a9cb8334c3c.pdf
    • https://static.usrfiles.com/ugd/b8c837_9af6a01153da4800bb69aa80a8cf6f5b.pdf
    • https://static.usrfiles.com/ugd/d94ae5_911a0477f6f34cb6946ab3d11e032c18.pdf
    • https://cdn.shopify.com/s/files/1/0429/9866/1279/files/95171244582.pdf
    • https://cdn.shopify.com/s/files/1/0432/1555/2674/files/89457774084.pdf
    • https://cdn.shopify.com/s/files/1/0431/2537/5125/files/vexunamogo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5470/2496/files/78274062884.pdf
    • https://cdn.shopify.com/s/files/1/0432/3573/7755/files/23190907186.pdf
    • https://cdn.shopify.com/s/files/1/0431/1751/0818/files/26265720779.pdf
    • https://static.usrfiles.com/ugd/b8c837_b111bcfe82c842a28e11f9337c50e9df.pdf
    • https://static.usrfiles.com/ugd/e643da_901a5513092f4f7391d0e28239617b5f.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007421.bin
be4afff43f8731ea35fa3ea4b863a64b9c19759c1b4124f1be92db9fae711122		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7421 5644 bytes
font_01_sfnt_off0000874b.bin
a63676151bb994e65c84cff5907834286c4f6d7d44c6178c20071c1e3b9da103		 pdf-font-stream PDF embedded font (sfnt) at offset 0x874B 9892 bytes

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