Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b8c75d1de80a2f8…

MALICIOUS

PDF

43.7 KB Created: 2020-08-29 20:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e87b35cfca32e04780caf88bcc2e95cc SHA-1: ceda70927048cdefbeaf197f89a90b8b5a2c8cf4 SHA-256: 6b8c75d1de80a2f877040dd5a7739c1099accc525993b41ed3ddb8ed307fcfe4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. The presence of many external links suggests a link farm or SEO manipulation tactic, potentially leading users to malicious content or phishing sites.

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.me/wix?keyword=mod%25C3%25A8le+num%25C3%25A9rique+de+terrain
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_6fb0485d9fc746c787d23e5200cb245e.pdf
    • https://static.usrfiles.com/ugd/b8c837_a811c98b19fb400c9221fc933725b746.pdf
    • https://static.usrfiles.com/ugd/b8c837_b6b5c9e69a094842918f2183ba34707f.pdf
    • https://static.usrfiles.com/ugd/253000_fa124d8159e64e5aaa8273c386ece02d.pdf
    • https://static.usrfiles.com/ugd/6908d7_9e46b55434404923a3f81333a5912952.pdf
    • https://static.usrfiles.com/ugd/b8c837_c60f0e16c4c7435696cc43e21fbc263b.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce8485c771254e16b8da408b3e5501c1.pdf
    • https://static.usrfiles.com/ugd/b8c837_d60ebab9554d4247b20a0034793baf23.pdf
    • https://static.usrfiles.com/ugd/3aca14_8d4ebf4362a34464bdd136147a135c7b.pdf
    • https://cdn.shopify.com/s/files/1/0434/7517/3529/files/sovaf.pdf
    • https://cdn.shopify.com/s/files/1/0427/9628/6111/files/47532235814.pdf
    • https://cdn.shopify.com/s/files/1/0433/3839/9912/files/57367640329.pdf
    • https://cdn.shopify.com/s/files/1/0428/5494/0828/files/4._3_liter_v6_vortec_engine_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0437/3417/1797/files/biology_notes_for_class_12_cbse_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/5338/3833/files/imperative_form_of_essen.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000641d.bin
32a2db7d26bd58fadf02ac436ebf8891c2d8b6ea1284a957c67caae14a65cb38
pdf-font-stream PDF embedded font (sfnt) at offset 0x641D 5208 bytes
font_01_sfnt_off00007521.bin
dda586394f269dc732a673d711259c9d1ac76800c8463549042483047eb67991
pdf-font-stream PDF embedded font (sfnt) at offset 0x7521 14404 bytes