Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c194dec0e9a8796…

MALICIOUS

PDF

41.6 KB Created: 2020-08-22 23:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e79a0a81d634db1db8e27c6679fd5972 SHA-1: 41467704ecdd73bc1078f2f5a9cd8a496cb204cf SHA-256: 4c194dec0e9a87961db6798b93cb43528cb4cac26e6098fe9e2953c22fd0aa79
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is designed to lead users to malicious sites. The document body also contains numerous links to PDFs hosted on various domains, including cdn.shopify.com, suggesting a link farm or redirection strategy. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is intended for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.com/pify?keyword=all+beautiful+flowers
    • http://repeto.evwordsmiths.com/uploads/1/3/0/9/130969685/8189960.pdf
    • http://files.tccschattanooga.com/uploads/1/3/0/8/130814393/fotowonuxobe_batanu_pogakaz.pdf
    • http://tajilo.krakenemporium.com/uploads/1/3/0/7/130776394/a0c932a8.pdf
    • http://piwuxefip.uncdf-a2f-kigoma.com/uploads/1/3/0/7/130776225/881982.pdf
    • http://files.bunkybambino.com/uploads/1/3/0/7/130775727/jimuvotoz.pdf
    • https://cdn.shopify.com/s/files/1/0430/6799/8362/files/napumuma.pdf
    • https://cdn.shopify.com/s/files/1/0432/7528/8742/files/26718125767.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5086/files/nufojukezidufu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wugituvunajobi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6717/1223/files/90970898143.pdf
    • https://cdn.shopify.com/s/files/1/0436/4160/2208/files/66468021891.pdf
    • https://cdn.shopify.com/s/files/1/0432/2312/2077/files/tabesiniki.pdf
    • https://cdn.shopify.com/s/files/1/0433/8574/9665/files/xemumibapikufililema.pdf
    • https://cdn.shopify.com/s/files/1/0450/6324/1891/files/environmental_impact_report_negative_declaration.pdf
    • https://cdn.shopify.com/s/files/1/0439/3828/3678/files/sasefarerekafotezotu.pdf
    • https://cdn.shopify.com/s/files/1/0437/8309/4434/files/evidence_based_medicine_book.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_off00006655.bin
934c88f374cb8323a0481324e0b6ec12c7f58f8b4349163ad8cc076177392fb2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6655 4980 bytes
font_01_sfnt_off00007763.bin
c2e175c9b6fdef24517bd5e6a56959a3a08cae73d31ba3e39dec02baf6c6fa61
pdf-font-stream PDF embedded font (sfnt) at offset 0x7763 10024 bytes