Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bcf00f5c4cd353e…

MALICIOUS

PDF

53.7 KB Created: 2020-08-19 08:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a3b4879a7c8dbe7d52212dd963da1dd SHA-1: 096ba903d73355ec41c43f70faf0108389a7dbbb SHA-256: 6bcf00f5c4cd353ed04a1ddb1da27e49e8d75d14d8860badbfb6cb2261779c50
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous 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 URLs that are likely part of a link farm designed to lure victims. The primary malicious activity observed is the redirection to potentially harmful external sites.

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=aldehyde+ketone+carboxylic+acid+pdf
    • http://files.publishershaven.com/uploads/1/3/1/8/131871439/649349.pdf
    • http://files.duannkier.com/uploads/1/3/0/7/130775971/7854723.pdf
    • http://files.regalbakeryusa.com/uploads/1/3/1/4/131406412/7743718.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6511/4775/files/41044316949.pdf
    • https://cdn.shopify.com/s/files/1/0429/6831/8105/files/breathing_techniques_for_stress.pdf
    • https://cdn.shopify.com/s/files/1/0439/3595/7147/files/89720008048.pdf
    • https://cdn.shopify.com/s/files/1/0438/5816/5925/files/tanka_poetry_example.pdf
    • https://cdn.shopify.com/s/files/1/0438/1392/9122/files/natik.pdf
    • https://cdn.shopify.com/s/files/1/0434/2621/8134/files/37242186050.pdf
    • https://cdn.shopify.com/s/files/1/0440/4445/2005/files/consumer_key_twitter.pdf
    • https://cdn.shopify.com/s/files/1/0431/6083/0108/files/battle_net_so_slow.pdf
    • https://cdn.shopify.com/s/files/1/0431/1387/3569/files/xowolomexugepazemamapes.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/51523851631.pdf
    • https://cdn.shopify.com/s/files/1/0434/5639/7464/files/google_docs_find_and_replace.pdf
    • https://cdn.shopify.com/s/files/1/0433/9915/1768/files/ap_grama_sachivalayam_model_papers_in_telugu.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_off00007e5d.bin
f77fb4ca352b73e94845c65d1631aa326a8e35c02681a938a537f53e19c477b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E5D 5428 bytes
font_01_sfnt_off000090cd.bin
63b1c18aaf3f7d055e6a68f023d00c6ff879ec4bbdb9a58638e6fb8f2c1df993		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90CD 10540 bytes
font_02_sfnt_off0000b4e6.bin
014fdb7076ebfc326e48e50914f0077be73d9a972b327c9fef30e9d59f054234		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E6 16080 bytes

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