Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25da6c384cd92e5…

MALICIOUS

PDF

44.2 KB Created: 2020-08-31 01:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 92a89c33dff6a9849eef783f653426c7 SHA-1: 67256b1435b26531d28d4ec8e5437a8c73a57220 SHA-256: a25da6c384cd92e54e9d020f6da3958f5a778f408a448bc3679140e97cb7024d
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on static.usrfiles.com. One of these links, https://ttraff.ru/wix?keyword=ejemplo+de+protocolo+de+investigacio, is flagged as a malicious redirector. This suggests the document is part of a link farm or SEO poisoning campaign designed to drive traffic to malicious sites.

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.ru/wix?keyword=ejemplo+de+protocolo+de+investigacio
    • https://static.usrfiles.com/ugd/b8c837_f68e2bddd5974249b1b08a81a4b195fa.pdf
    • https://static.usrfiles.com/ugd/b8c837_b2054b899cf84fc094ad39843c379632.pdf
    • https://static.usrfiles.com/ugd/83b1b3_75ee52a3dfac4e30b6a897e3b0cda64e.pdf
    • https://static.usrfiles.com/ugd/24853a_3e998c283dfe410889aacf4e9affd4eb.pdf
    • https://static.usrfiles.com/ugd/eda9ba_0aa6aa181ee247ca8156d711b1282faa.pdf
    • https://static.usrfiles.com/ugd/c12414_4dc41e8c17d749f1bdc6e135fc57e51e.pdf
    • https://static.usrfiles.com/ugd/b8c837_cd4241b57a8d4823a858e18bfd4f8e52.pdf
    • https://static.usrfiles.com/ugd/30e015_371b42215d1742c5b74808960cff66e0.pdf
    • https://cdn.shopify.com/s/files/1/0434/5013/8784/files/43263595170.pdf
    • https://cdn.shopify.com/s/files/1/0427/6515/6508/files/rakemuku.pdf
    • https://static.usrfiles.com/ugd/55cc32_76bd64ce2bf74014aeea46e292d0383e.pdf
    • https://static.usrfiles.com/ugd/09273f_161c5472cc404401a304502bd9ef9300.pdf
    • https://static.usrfiles.com/ugd/f459ea_ded59d76137f46098bcf75176407f825.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_off00006bfb.bin
36e325b8fec969bbead67f515e6ae998705d7109de1ab7f7c45ced7cae3830d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BFB 5484 bytes
font_01_sfnt_off00007e9c.bin
edf3b5c068bb182651840a523266fbd862cc7053222d0352f128cb70ca075afc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E9C 11124 bytes

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