Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ec944fc243b1bcf…

MALICIOUS

PDF

45.0 KB Created: 2020-09-09 12:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0157c7a8ae22c91c46321751c7fbcc27 SHA-1: 7e35eaa7d2891ed534fcc53d75cc6bbf1c07f1d7 SHA-256: 1ec944fc243b1bcf02e5a65567ac9a74f22c6474d7acae5fed0272f64c40fddc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with 30 external PDF links, many of which are hosted on Shopify. The primary malicious link, https://ttraff.me/wix?keyword=basin+street+blues+tuba+sheet+music, is identified as a redirector to malicious infrastructure. This suggests the document is designed to lure users to malicious sites, likely for phishing or malware distribution, masquerading as a search result for sheet music.

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=basin+street+blues+tuba+sheet+music In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2267/2284/files/24740071052.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1802/5122/files/military_alphanumeric_code.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7355/2040/files/waruxeduvuwebezekiduje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5470/3526/files/niveseriwonujogineje.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b50c55_6e80363cb6574ed48d09ca9fa5e6bae5.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/57c819_7369a414a10c4fe1b9c5fa28296a5603.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/22bf55_b530d0f2cbfe4e938c77c996913e4d7c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/035627_6db10715278e4be9b6c9f2e88c16f385.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/599026_8e15dafca6ee49688c4be274025454f3.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a76634_3c518ae16e0a4ee8bff30632f72494a9.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/6a44d8_a9da3c5dd0034276bb35d162840991bf.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/3b0c81_6e2886a7331440b384dcf061aa89adb1.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/957c7b_5cc41765bd9e4a768d656741c77236f9.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a467d2_0fab0535241242cab93d0477234ac761.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/74e905_e6d3d3c2fd7249f99d1333eb20382a8e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/d4579c_acff8a8eefbf458aa2466cdc02d15498.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69F0 5228 bytes
SHA-256: a7389a429943248ec10be00534f91e3c8a19d5fc9192d32b0c78a10cf7c4ee8b
font_01_sfnt_off00007b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B8B 13904 bytes
SHA-256: 9ba2b14520312fb22e45049c090ababfc09ca046d5cf383ed04deee6605ac143

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