Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d553a5dd40283a2…

MALICIOUS

PDF

42.6 KB Created: 2020-08-31 00:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 70984a08c247de4363db79344140e53c SHA-1: 504c2c7efc6857599a45634611e17f9d6a7db4e0 SHA-256: 2d553a5dd40283a250adb48c45f134f1a9126a2c8099bb19ffb9130e2218ea6a
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a link disguised as a math worksheet, which redirects to a malicious URL. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this behavior. The PDF also contains a link farm, as indicated by PDF_SEO_LINK_FARM, suggesting an attempt to distribute malicious content or manipulate search results. No scripts were extracted, but the presence of a malicious redirector is sufficient evidence of malicious intent.

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.cc/wix?keyword=grade+5+math+word+problems+worksheet
    • https://static.usrfiles.com/ugd/2813e2_5a00c9c04131488793aaf18cfefefda8.pdf
    • https://static.usrfiles.com/ugd/1cc7e8_8af25043bd5c4abca618504f4a7e4c7d.pdf
    • https://static.usrfiles.com/ugd/b8c837_f54f9318435f4cac88e1bd6d3ad48bfb.pdf
    • https://static.usrfiles.com/ugd/d55797_3d657b881ddf4f579baa7d9f92b889df.pdf
    • https://static.usrfiles.com/ugd/b8c837_b230c4e6b47f4f22a88feba991eb1ddd.pdf
    • https://cdn.shopify.com/s/files/1/0465/0257/6286/files/fallout_4_emergent_behavior_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/7663/9134/files/chargesheet_full_movie_online.pdf
    • https://static.usrfiles.com/ugd/8b49c6_fa53e3eb630649e1ab3b976f151bcd70.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c8f0f166b774fa6be07bed4b8b3d198.pdf
    • https://static.usrfiles.com/ugd/b58d21_4d5e1ffe84974d0bad30b70e5c3e354c.pdf
    • https://static.usrfiles.com/ugd/8a419d_8a715aa42aea40b38b4210785b0806a3.pdf
    • https://static.usrfiles.com/ugd/b8c837_f85a0c8408f24b5a8176195d23d1c47f.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_off00006669.bin
a0e2b91dbcd7663ff77a6369b1714acd0954343a6a22d1707e0f0a04a3bc9435		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6669 5652 bytes
font_01_sfnt_off00007995.bin
37d0b73ec02cf1de636faf01de79708219920c36378156ff5e0ce81034276f61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7995 10504 bytes

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