Malicious PDF — malware analysis report

Static analysis result for SHA-256 793ed992ec86a94e…

MALICIOUS

PDF

41.5 KB Created: 2020-08-31 14:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9d6f0f329aca8e022b6cc9c399d0f18 SHA-1: a80c2f32910d10e8ba0ed385d60a0f85c9199b03 SHA-256: 793ed992ec86a94efa5a548234886a5b6035b60268fc8da9b1a9ef5fa23c84b4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/pify?keyword=cretinism+is+a+congenital+form+of'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of the malicious URL is sufficient evidence for the attack pattern.

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.com/pify?keyword=cretinism+is+a+congenital+form+of
    • https://static.usrfiles.com/ugd/b8c837_1e767dd5639445e2818aecc505d05f85.pdf
    • https://static.usrfiles.com/ugd/bf650e_571fcbbeaca4464eba5e131c7bc86cc1.pdf
    • https://static.usrfiles.com/ugd/b8c837_c77fd0c74c28410cb4a8da0c8e7e9c11.pdf
    • https://cdn.shopify.com/s/files/1/0428/5782/4419/files/ximexarigidezeg.pdf
    • https://cdn.shopify.com/s/files/1/0430/4073/5381/files/gisuretusivapubirekepejip.pdf
    • https://cdn.shopify.com/s/files/1/0438/2998/5430/files/dmv_h-_6.pdf
    • https://cdn.shopify.com/s/files/1/0434/7500/9696/files/algorithms_in_c_robert_sedgewick_part_5.pdf
    • https://cdn.shopify.com/s/files/1/0433/9315/5230/files/68161518074.pdf
    • https://cdn.shopify.com/s/files/1/0430/6891/5863/files/votosarabobuwo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0571/4338/files/funejuxig.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_off0000664a.bin
862ff0b7163b79e3e27185bb9d312c12661c6c41c19ef432e16ff08ae1e3ca04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x664A 5104 bytes
font_01_sfnt_off0000778a.bin
613fd0c7feb5f62ec05c71a4bd5de3dfbdc597f3d9b44e5b4f1903d26512dc36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x778A 9940 bytes

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