Malicious PDF — malware analysis report

Static analysis result for SHA-256 af395aa711135a49…

MALICIOUS

PDF

43.8 KB Created: 2020-08-30 02:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4af83a556a4503df92a57ffe5b60b3b8 SHA-1: 178a857a3d3efc7404e4a5aeefa06ef6789cf611 SHA-256: af395aa711135a49be4b4b1abce33ebb8b7eeda221202429c39f0603454e45a5
120 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=download+idm+silent+install+gigapurbalingga'. This indicates the document's primary purpose is to lure users to a malicious site, likely for downloading unwanted software or further malware. The presence of a large number of external PDF links, many pointing to static.usrfiles.com, suggests a link farm or SEO poisoning tactic to increase visibility of the malicious redirector.

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=download+idm+silent+install+gigapurbalingga
    • https://static.usrfiles.com/ugd/b8c837_86529403d23d4fd38e9b14018a7b77cd.pdf
    • https://static.usrfiles.com/ugd/b8c837_02b4302d4f1043058007fd589118c5d8.pdf
    • https://static.usrfiles.com/ugd/b8c837_9651985c44f0437dbdaa0d365ca0ab8f.pdf
    • https://static.usrfiles.com/ugd/a2e20a_9bdc5080939e4535a19fe73679ce7dac.pdf
    • https://cdn.shopify.com/s/files/1/0439/0223/8875/files/pmay_offline_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0437/5035/9194/files/nidanogopo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9163/9968/files/difference_between_broadside_array_and_endfire_array.pdf
    • https://static.usrfiles.com/ugd/6f7357_479532ee6798493fb3bbe72d822493b8.pdf
    • https://static.usrfiles.com/ugd/16a96a_575490ab0bc345639950f7b38c57a667.pdf
    • https://static.usrfiles.com/ugd/b8c837_fa1ed2993df2487d960fe704b1703569.pdf
    • https://static.usrfiles.com/ugd/b8c837_d667486735de4c35b8a8b58a211e07ee.pdf
    • https://static.usrfiles.com/ugd/b8c837_893b824729e540a7a7df4385467bf7b6.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ec5.bin
334225650a13a9f8bcf635d266c082d1159f3b34070369fcc82707dc77d84146		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EC5 5392 bytes
font_01_sfnt_off00007112.bin
f3103edb379e49604622a2d89deedd72df076e76a03998f91f564454d79c4c96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7112 10612 bytes
font_02_sfnt_off00009450.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9450 4324 bytes

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