Malicious PDF — malware analysis report

Static analysis result for SHA-256 753acacdbb8a7b76…

MALICIOUS

PDF

49.3 KB Created: 2020-09-17 23:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a350588edd9c59bef657d73012f0da44 SHA-1: 42fe68208abc8ff87578c0ab21769df57901615b SHA-256: 753acacdbb8a7b76ffafe6db7bceb0682f4639f2c84767aa80e9d6200b3f40d1
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.club/wix?keyword=proof+of+relationship+letter+sample+for+visa'. This URL is presented within the document body, disguised as a search result. The PDF also contains a mass external PDF link farm, with many links pointing to Shopify domains, likely for SEO manipulation to increase visibility of malicious content. The ML classifier strongly flagged this PDF as malicious.

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.club/wix?keyword=proof+of+relationship+letter+sample+for+visa
    • https://cdn.shopify.com/s/files/1/0433/1339/7924/files/cbse_class_12_accountancy_project_sample.pdf
    • https://cdn.shopify.com/s/files/1/0431/8691/3431/files/pokewanamo.pdf
    • https://cdn.shopify.com/s/files/1/0432/4642/0132/files/inspector_calls_exam_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/9181/2767/files/animal_sounds_name_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0430/6649/1042/files/javascript_number_to_string.pdf
    • https://cdn.shopify.com/s/files/1/0440/5752/6437/files/the_beatles_lyrics.pdf
    • https://6e1f3a07-fbca-4b64-9b32-aa36bb7cb11e.filesusr.com/ugd/610d21_ce0cd0c2e1dd4c5baa28df9691664373.pdf?index=true
    • https://8e681f5a-a0e3-42cf-8a5d-a71c10dd5ff9.filesusr.com/ugd/3ed44c_7a7bab10db9645139dd91d3f3cd1aa41.pdf?index=true
    • https://0b59de2a-76e2-4894-abae-337391778b04.filesusr.com/ugd/1a1092_4da4dcbfed484e2fbfd0ac38f6d973c2.pdf?index=true
    • https://dc209492-5681-4d5b-8d0d-f5d48b535639.filesusr.com/ugd/314c35_ffd80e9bd087483b89edb1b9c3b4a8df.pdf?index=true
    • 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/
    • https://cdn.shopify.com/s/files/1/0432/4642/0132/files/inspector_calls_exam_question

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007628.bin
b432b091c88316eb1b85a8a4073a92fd65997cee38a1b632b468073758c5e6a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7628 4988 bytes
font_01_sfnt_off000086e5.bin
f679b404d5a186c731d9e67143545cfbf3fb775128bc87d0c18098d9575ff034		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86E5 10160 bytes
font_02_sfnt_off0000a9c2.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9C2 4324 bytes

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