Malicious PDF — malware analysis report

Static analysis result for SHA-256 1af203ae7ddc7b8e…

MALICIOUS

PDF

41.0 KB Created: 2020-09-03 01:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b74f7821f962c7f151ad81b411811b33 SHA-1: 2e01ca199ff3f181b80c2ef5168b401f4095f483 SHA-256: 1af203ae7ddc7b8eee1d5775d8100b2a363e9e630a846d49aa59398ea31b3e2c
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=microbiology+critical+thinking+questions+answers'. Additionally, it exhibits a PDF link farm behavior, with numerous embedded links, including one to 'https://cdn.shopify.com/s/files/1/0438/9234/2939/files/port_huron_craigslist.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though partially corrupted, contains the same keyword as the malicious URL, suggesting a lure to trick users into clicking the link.

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.me/wix?keyword=microbiology+critical+thinking+questions+answers
    • https://cdn.shopify.com/s/files/1/0438/9234/2939/files/port_huron_craigslist.pdf
    • https://cdn.shopify.com/s/files/1/0432/3393/5515/files/apocryphal_books.pdf
    • https://cdn.shopify.com/s/files/1/0434/9739/0244/files/wuzuvegut.pdf
    • https://cdn.shopify.com/s/files/1/0463/6806/3643/files/takowamoponote.pdf
    • https://cdn.shopify.com/s/files/1/0433/4528/1183/files/towul.pdf
    • https://static.usrfiles.com/ugd/b8c837_aeddb19347b04e68bcea4855b5baf55f.pdf
    • https://static.usrfiles.com/ugd/63022f_953a94c5cbce45e5964ea7881fc8ec46.pdf
    • https://static.usrfiles.com/ugd/46429b_732f5581d9d44772968f56409d5be13b.pdf
    • https://static.usrfiles.com/ugd/66f7a0_4ff37a33c0dc49f2bfe53bfb6c0561b7.pdf
    • https://cdn.shopify.com/s/files/1/0439/7151/0430/files/65112279826.pdf
    • https://cdn.shopify.com/s/files/1/0431/6259/9585/files/zolunofug.pdf
    • https://cdn.shopify.com/s/files/1/0431/8317/7885/files/fanovarosafi.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_off00006046.bin
c239b578939732331422b79115eecebbae6eacd1538c329d7fdd71f7029758e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6046 5592 bytes
font_01_sfnt_off00007361.bin
a1be3aec10e21a61f45d97abde71d8551a6bd8dfa9ca19b76825f376066c9f82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7361 10544 bytes

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