Malicious PDF — malware analysis report

Static analysis result for SHA-256 043dd9b8675c54d0…

MALICIOUS

PDF

62.6 KB Created: 2020-08-19 20:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddaafad6e5944c4d809ec582fc6a2c09 SHA-1: 752d4fa8350185e579d602bf0f7865f02031d742 SHA-256: 043dd9b8675c54d0a8318097b9533c7e363c2f7eca57b59f1aa1854430824fba
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to a harmful site. The presence of a large number of external PDF links, many pointing to Shopify, suggests a link farm or SEO manipulation tactic. While no scripts were extracted, the ML classifier and redirector link heuristic strongly indicate malicious intent.

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.cc/pify?keyword=acute+on+chronic+liver+failure+aasld+guidelines
    • http://files.austintxtherapists.com/uploads/1/3/2/7/132740293/c21bc9e8.pdf
    • http://lawojuz.donnahebertdesign.com/uploads/1/3/1/4/131407435/2150079.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/8389/0850/files/kenosha_news_epaper.pdf
    • https://cdn.shopify.com/s/files/1/0432/8115/4204/files/80136747765.pdf
    • https://cdn.shopify.com/s/files/1/0433/0897/4235/files/92785372388.pdf
    • https://cdn.shopify.com/s/files/1/0434/8005/5965/files/834320422.pdf
    • https://cdn.shopify.com/s/files/1/0431/2550/6208/files/manual_of_the_planes.pdf
    • https://cdn.shopify.com/s/files/1/0428/6621/3031/files/como_incluir_assinatura_digital_em.pdf
    • https://cdn.shopify.com/s/files/1/0436/5513/5390/files/keys_to_answered_prayers.pdf
    • https://cdn.shopify.com/s/files/1/0438/5089/1424/files/sebegesesuler.pdf
    • https://cdn.shopify.com/s/files/1/0435/8632/2600/files/12174343453.pdf
    • https://cdn.shopify.com/s/files/1/0433/6861/1998/files/mejobom.pdf
    • https://cdn.shopify.com/s/files/1/0429/1067/9203/files/chinese_character_dictionary.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000093f8.bin
dd8003d503fa3a1a6348eb497e0737db6c38262d04f32144e6d0afb39e784076		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93F8 5212 bytes
font_01_sfnt_off0000a5a9.bin
3862c473b14fd042b097cdff9c628fe9b36c06376097cfbe12c327cc28fc07ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5A9 10536 bytes
font_02_sfnt_off0000c9d5.bin
99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D5 16060 bytes
font_03_sfnt_off0000de6f.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6F 4324 bytes

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