Malicious PDF — malware analysis report

Static analysis result for SHA-256 90cacbd8c5df667f…

MALICIOUS

PDF

41.2 KB Created: 2020-09-17 19:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c3d97d7615a491e2b869fe79bcc9bd5 SHA-1: a11a6615791667b57fcadd718aa9806cf3354a5f SHA-256: 90cacbd8c5df667fe7cfec4095128431a60f3e35b3e7f1dbda89d63c9398043b
120 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to the presence of a large number of external links, a technique often used to create SEO link farms or redirect users to malicious sites. One such link, 'https://ttraff.club/wix?keyword=absolute+crossword+answer', is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains this URL and other PDF links, reinforcing the attack pattern. The file's structure and the heuristics strongly suggest it's designed to lure users to external, potentially harmful, content.

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.club/wix?keyword=absolute+crossword+answer
    • http://dobenorob.brighterwaysuk.com/uploads/1/3/2/6/132682646/9895457.pdf
    • http://files.azgrit.com/uploads/1/3/1/6/131636834/nejibosanepal.pdf
    • https://7a6faf4c-94ad-4a2f-b835-a388c8e8baae.filesusr.com/ugd/11b39a_c7d180612f42412481127961ddeac07e.pdf?index=true
    • https://14ebea45-acb7-4512-8320-3470d71ce969.filesusr.com/ugd/97634b_18597bce2b63474985ab652a40064fce.pdf?index=true
    • https://5420ca1e-ec98-4de1-927a-2948ffd11e5d.filesusr.com/ugd/c83fdb_55a831f82cc7410c88ae464f7c6c1149.pdf?index=true
    • https://ff878c9e-c8ae-46ff-a56a-8d379a180c2f.filesusr.com/ugd/d2759c_08bb7b94988b44b4a71b38c3cf21df8d.pdf?index=true
    • https://30d6d690-1aed-4656-aafd-5e881fb53965.filesusr.com/ugd/268ab1_d0926665861a44eea48e8df786516847.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0430/7343/7845/files/how_do_you_teach_guided_reading.pdf
    • https://cdn.shopify.com/s/files/1/0485/0368/5275/files/tulilewatexutolawepa.pdf
    • https://cdn.shopify.com/s/files/1/0430/8107/2789/files/grade_2_times_table_worksheets.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_off00006482.bin
4bf636a8e1bfe23ed8544a8b3ec8eb7436d56557751135f36f5e36aae841d79b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6482 5156 bytes
font_01_sfnt_off00007624.bin
c85439635c8158d99f79d3692dc7238b64ff5989948a954d1a153612968a9535		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7624 10140 bytes

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