Malicious PDF — malware analysis report

Static analysis result for SHA-256 083cf912bae20f1c…

MALICIOUS

PDF

101.7 KB Created: 2020-09-10 10:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6186ea1f8aa2c367a7ceb07cf588df64 SHA-1: 36d118102e6f8703c8d0858a41025cebc27d941b SHA-256: 083cf912bae20f1ce5866f4e4e49e5ab63b995f2c877633b4b870d7cdcf2aee0
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised with keywords related to 'Ebay developer platform'. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the same URL, suggesting the primary purpose is to redirect the user to malicious infrastructure.

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.ru/pify?keyword=ebay+developer+platform
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7753/2824/files/8966526942.pdf
    • https://cdn.shopify.com/s/files/1/0438/1717/3149/files/participatory_action_research.pdf
    • https://cdn.shopify.com/s/files/1/0431/7157/8007/files/suguvef.pdf
    • https://cdn.shopify.com/s/files/1/0431/8684/7903/files/65076559976.pdf
    • https://cdn.shopify.com/s/files/1/0431/7331/4715/files/brief_aggression_questionnaire.pdf
    • https://cdn.shopify.com/s/files/1/0437/8935/3118/files/78533301628.pdf
    • https://cdn.shopify.com/s/files/1/0429/0999/1075/files/engineering_drawing_books.pdf
    • https://cdn.shopify.com/s/files/1/0440/1741/8405/files/3868506023.pdf
    • https://cdn.shopify.com/s/files/1/0429/0409/2839/files/48491749369.pdf
    • https://static.usrfiles.com/ugd/6260fe_ce5672758f2a4433b65ef45edbccc798.pdf
    • https://static.usrfiles.com/ugd/debbe1_1892cb54a2374eedadb8d464efabb2a2.pdf
    • https://static.usrfiles.com/ugd/d01287_717bb9edcfb44da485fdff3138805d80.pdf
    • https://static.usrfiles.com/ugd/bcfc12_38a9a9e1a204492e9511113a7abae3c9.pdf
    • https://static.usrfiles.com/ugd/22bf55_043412cbeee649fcb4b4db390b69a0b9.pdf
    • https://static.usrfiles.com/ugd/3d0627_e79cd4ac15b2420b8b86c58d6cd675a1.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013b5a.bin
81783711d9c8f921abf2b64ec9f100795b1558148e1b54ddcca596d8de089699		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5A 5268 bytes
font_01_sfnt_off00014d3f.bin
7efeed3d15b7a161eb16092b7ebbe98da47a64906bc7059e7d0cf5ae7acb8d9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D3F 11516 bytes
font_02_sfnt_off0001735f.bin
31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1735F 16204 bytes

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