Malicious PDF — malware analysis report

Static analysis result for SHA-256 d855f1210b4ff7d1…

MALICIOUS

PDF

44.7 KB Created: 2020-09-16 16:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8f0fed5d5ae68eb0e08e8085c814f99 SHA-1: cea21993f131677319d8bfe2aeb2ff24967c306c SHA-256: d855f1210b4ff7d1b4901e24f6cf0cf2ca35e19b842778477c2111d812a5e369
152 Risk Score

Malware Insights

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

The PDF document contains a malicious redirector link disguised as a repair manual. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic shows a large number of links, with the primary one pointing to a known malicious redirector. The document body itself contains the lure text and the malicious URL.

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.link/wix?keyword=2000+toyota+rav4+repair+manual+pdf
    • http://files.chrysm.org/uploads/1/3/1/4/131436981/6059427.pdf
    • http://files.fluffdesignsco.com/uploads/1/3/1/3/131380251/diviturakatidojojo.pdf
    • http://files.triplehranch.org/uploads/1/3/0/8/130874672/nukeposamefidaxoxoku.pdf
    • https://cdn.shopify.com/s/files/1/0434/7097/9237/files/definition_of_development.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37638787324.pdf
    • https://cdn.shopify.com/s/files/1/0441/0313/9480/files/autocad_revit_lt_suite_2014.pdf
    • https://cdn.shopify.com/s/files/1/0429/1916/6119/files/albert_camus_etranger.pdf
    • https://cdn.shopify.com/s/files/1/0434/0219/9196/files/mathematical_symbols_and_their_meanings.pdf
    • https://cdn.shopify.com/s/files/1/0435/0096/1947/files/nebunurativifusamuzapagok.pdf
    • https://cdn.shopify.com/s/files/1/0440/4707/3445/files/88970694895.pdf
    • https://00819d8f-8d29-41fa-81e6-d452beb49495.filesusr.com/ugd/b463f2_1953755e6bce45b8a9a4ed1780a3ab78.pdf?index=true
    • https://e9c64cba-dd64-4c9f-a3fc-3e4cb357dd46.filesusr.com/ugd/b56239_58f6e0c562324ab18a06cdb4b9697a2f.pdf?index=true
    • https://43c83fb5-2a5e-4a77-924f-607b3cc01b67.filesusr.com/ugd/7d1dc9_2a7989266c9e41c8a861c107c2ca209f.pdf?index=true
    • https://2e9412aa-e272-447a-b1d4-1cfd59af203f.filesusr.com/ugd/24deb6_c240d352066d45a08f4bab19d3fce481.pdf?index=true
    • 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_off00006f03.bin
d99188dc328f58b8db2267f2ddb5566c5ff9cba2824706155d4ef20d8eddb10f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F03 5436 bytes
font_01_sfnt_off00008180.bin
af09705bfa634a4d56520ef5328c17995281e94550fe0769b6dff7cd78e0b4ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x8180 10468 bytes