Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe8889b8b780b414…

MALICIOUS

PDF

42.8 KB Created: 2020-09-04 15:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 381e71aa4a65fb3861d80789a4dfa401 SHA-1: 6d3475828eae1efcefb6cbd2592d47fbff246b7c SHA-256: fe8889b8b780b414f46b9acf2278cf17174ac508025d7bf690364d0845627ad6
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.club'. This URL is presented within the document body, suggesting a lure to a malicious site. The presence of a PDF link farm heuristic further indicates the document's role in distributing malicious links. The ML classifier strongly supports the malicious nature of this PDF.

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.club/wix?keyword=alpena+mi+restaurant+guide
    • https://cdn.shopify.com/s/files/1/0431/3645/0717/files/cours_vba_excel_2020_gratuit.pdf
    • https://cdn.shopify.com/s/files/1/0430/4742/0066/files/64782684572.pdf
    • https://cdn.shopify.com/s/files/1/0433/3414/0056/files/vuferegi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8072/0294/files/9762133233.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/dofamakebufenu.pdf
    • https://cdn.shopify.com/s/files/1/0448/1158/3645/files/bonafide_certificate_school.pdf
    • https://cdn.shopify.com/s/files/1/0435/3536/8346/files/define_barrier.pdf
    • https://cdn.shopify.com/s/files/1/0439/5394/6782/files/16309718118.pdf
    • https://cdn.shopify.com/s/files/1/0436/5864/1561/files/94972460839.pdf
    • https://cdn.shopify.com/s/files/1/0433/7552/6042/files/discord_how_to_do_italics.pdf
    • https://static.usrfiles.com/ugd/ca300b_70e60910a21c43539f7f6dd4bd63a012.pdf
    • https://static.usrfiles.com/ugd/eaf48f_78bcb20d3dfd4bff9a0ccb07b41b481c.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_off00005aba.bin
844634f18410be0a64cc52d090e3b52be2a20f540f98d4370fcf005aa6ffc24a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ABA 5268 bytes
font_01_sfnt_off00006c8d.bin
21c5f71240391ece2efdd29ff507065802a2bab7cd0c5d212f53c33fb41edb41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C8D 15564 bytes

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