Malicious PDF — malware analysis report

Static analysis result for SHA-256 643c76188db7836a…

MALICIOUS

PDF

42.8 KB Created: 2020-08-30 07:39:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1cded85f7e6c6819631cccfc2a5a2ae SHA-1: 399c6aa9274f2fe5c6e4cb74eebc500ab5b0c4e6 SHA-256: 643c76188db7836a505264a9e50ae9ad0cdc7bc9a6b5fff777e73c00c27e321e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external resources, suggesting a link farm or SEO abuse tactic. One of the primary URLs, 'https://ttraff.ru/wix?keyword=angela+maria+marchetti+modella', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=angela+maria+marchetti+modella
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/5549/4806/files/daniel_dakota_wall_clock_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gejazopemovaro.pdf
    • https://cdn.shopify.com/s/files/1/0433/9892/2392/files/metafisica_aristoteles_libro_7.pdf
    • https://cdn.shopify.com/s/files/1/0435/4175/8101/files/putebuso.pdf
    • https://static.usrfiles.com/ugd/3aee12_8490489bdf3a46d09b943061bb2c07e7.pdf
    • https://static.usrfiles.com/ugd/2ac701_2b706e78929d4d38b86fa0c4f9162c44.pdf
    • https://static.usrfiles.com/ugd/b8c837_139045fa44014a24ac06e59f8c364058.pdf
    • https://static.usrfiles.com/ugd/9219f8_227a670623834935bf86822260bdf456.pdf
    • https://static.usrfiles.com/ugd/9d869b_7911e7bea35f4bfc959d92c3fa2d83d7.pdf
    • https://static.usrfiles.com/ugd/9374a7_c849ae42aa5e432d825f9ed2d402e5c9.pdf
    • https://static.usrfiles.com/ugd/5438e3_25d200b2870841ec917f6c2c06ae9ac7.pdf
    • https://static.usrfiles.com/ugd/e5cbe5_d4a4863dce9f4e5ab419917e84e992e0.pdf
    • https://static.usrfiles.com/ugd/26938b_69b063e0ede341208225721352722b97.pdf
    • https://static.usrfiles.com/ugd/b8c837_305de594db164e7fbf09200932dfe48d.pdf
    • https://static.usrfiles.com/ugd/b8c837_b19ae811a6e5425888552086771aff93.pdf
    • https://static.usrfiles.com/ugd/510a18_b766f1e8845c45c08eb8468832468a6d.pdf
    • https://static.usrfiles.com/ugd/cafc24_36da2ba1f824474687f48def2d2f5755.pdf
    • https://static.usrfiles.com/ugd/9f6a24_798f26482ec64c43ad230de76003370e.pdf
    • https://static.usrfiles.com/ugd/38bf1f_cfe0d8dba7994dbe870b2cdf0cbae274.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068a8.bin
dfa2c63a870ecc3a0d3ebb3651aea1beddc6982522421f193e0f9475b7933082		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68A8 5164 bytes
font_01_sfnt_off00007a01.bin
040382118166c26eced8be2bedf3061131fbfb89c1e82339eb669e680ecc19c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A01 11120 bytes

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