Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb78abd049b058d…

MALICIOUS

PDF

96.4 KB Created: 2020-08-31 03:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2302d7bc1a954f77bde6a66cee919170 SHA-1: 273ab4fc97d7d42068e52a6d2c99d71ed5eb3825 SHA-256: dcb78abd049b058d88beb24f5fc1a3aba287f9bd427ba3b19c9bcc50c42fad4b
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL 'https://ttraff.link/wix?keyword=danish+grammar+lessons', which is likely intended to lure users to a malicious site. The presence of a link farm suggests an attempt to broaden the reach of the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=danish+grammar+lessons
    • https://cdn.shopify.com/s/files/1/0430/3686/8762/files/22010608905.pdf
    • https://cdn.shopify.com/s/files/1/0432/1535/6067/files/82962217518.pdf
    • https://cdn.shopify.com/s/files/1/0431/3301/0074/files/ancient_roman_art.pdf
    • https://cdn.shopify.com/s/files/1/0429/1539/7788/files/49782110681.pdf
    • https://cdn.shopify.com/s/files/1/0435/5339/0743/files/probability_theory.pdf
    • https://static.usrfiles.com/ugd/345929_b3c1623ad28c469c84fe5dc551237f28.pdf
    • https://static.usrfiles.com/ugd/286fb8_356aad1c5eaf4b9ba71db9bf7b95a81b.pdf
    • https://static.usrfiles.com/ugd/a838c0_767a3dfdeeb447a0aa0d0ab9caf65bcf.pdf
    • https://static.usrfiles.com/ugd/b8c837_e2b7ad57c16844b7aa4a5a192e0c8564.pdf
    • https://cdn.shopify.com/s/files/1/0433/2149/1621/files/nimagevefabodujokafig.pdf
    • https://cdn.shopify.com/s/files/1/0430/3152/7577/files/ppt_free_templates_microsoft.pdf
    • https://cdn.shopify.com/s/files/1/0440/4540/2277/files/abbreviations_and_acronyms.pdf
    • https://cdn.shopify.com/s/files/1/0430/0200/3609/files/marathi_books_online_free_download.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010330.bin
72d27e5629b8be5d9fe303d4bc479e4b7bc2f3d565df556df7e1e64f39085ce6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10330 2952 bytes
font_01_sfnt_off00010db8.bin
2a1a8860a5f509af2dde4e67d60971c67094f5b56c3c0e32a62d1b2a2232d548		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB8 5096 bytes
font_02_sfnt_off00011ed7.bin
1981be102a55c29e41e4993dd36ede6063b468a10ee11872ca1b35e2506394a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED7 3056 bytes
font_03_sfnt_off00012bac.bin
2b8026b5fa81fc4616a6db6a49024fe13ce38db36c17878c40544041ca5b3183		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAC 16824 bytes
font_04_sfnt_off00015ea1.bin
2727b978b38a50f39ad898ebf475f8e8b5e599e3ec01ea6686db683a475b2ff9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15EA1 16088 bytes

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