Malicious PDF — malware analysis report

Static analysis result for SHA-256 c23093f84b971c71…

MALICIOUS

PDF

43.7 KB Created: 2020-08-21 16:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7db07b58e1ac137352de39ff9120047 SHA-1: 5081e8bc4b0d6460537463c288e5b558b8f286a2 SHA-256: c23093f84b971c71e8b17fb72339cce4051a2070e3983c39a1b8b2aa1c7699eb
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically `https://ttraff.cc/pify?keyword=formal+wedding+invitation+templates`. This URL is presented within the document body, disguised as a wedding invitation template, to entice users to click it. The PDF also contains a link farm heuristic, suggesting it's part of a larger SEO manipulation effort. The ML classifier strongly indicates maliciousness.

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.cc/pify?keyword=formal+wedding+invitation+templates
    • http://toximifu.sabracelets.org/uploads/1/3/1/1/131164250/ruxatisorupiriketa.pdf
    • https://cdn.shopify.com/s/files/1/0448/3085/1233/files/physical_science_concepts_in_action_chapter_5.pdf
    • https://cdn.shopify.com/s/files/1/0430/4375/0039/files/outlook_2016_archive_emails_manually.pdf
    • https://cdn.shopify.com/s/files/1/0436/4327/3369/files/64941855853.pdf
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/59943877680.pdf
    • https://cdn.shopify.com/s/files/1/0434/3437/7377/files/belajar_excel_2020_tingkat_mahir.pdf
    • https://cdn.shopify.com/s/files/1/0433/6268/0984/files/40519130017.pdf
    • https://cdn.shopify.com/s/files/1/0440/0365/5830/files/math_questions_and_answers_grade_10.pdf
    • https://cdn.shopify.com/s/files/1/0450/5151/0936/files/administrative_procedures_act.pdf
    • https://cdn.shopify.com/s/files/1/0432/1335/7214/files/82789701282.pdf
    • https://cdn.shopify.com/s/files/1/0432/4065/2960/files/1670368525.pdf
    • https://cdn.shopify.com/s/files/1/0436/1037/4307/files/relative_clauses_latin_worksheet.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_off00006d90.bin
c02a1b620c35d91d0e0d14f15231f024d1a63a37df75c459e5abd4bacee6fcb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D90 5388 bytes
font_01_sfnt_off00007fe0.bin
a285399f002d3c331d0656d025ff545e15f092351cc090ce2a6151edd449fd08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FE0 10016 bytes

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