Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b203376b2d5cc5…

MALICIOUS

PDF

43.1 KB Created: 2020-08-24 11:40:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9bb20d943f49c51c22f19aea66d0a98 SHA-1: 634e5cacf57772f48815c5bc87423b8c4d3b82db SHA-256: 04b203376b2d5cc5b115d9c72b411e03d9b2f9f3835d5a925095e4420105cefb
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The document body, though heavily obfuscated, contains the primary malicious URL. The ML classifier strongly indicated maliciousness, and the PDF structure itself suggests a link farm designed to obscure the true destination.

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=bamboo+bed+sheets+queen
    • http://gizejes.stevemitchellweddingdj.com/uploads/1/3/0/8/130813821/titifa_zonewopi.pdf
    • http://betipew.ralphroyrealty.com/uploads/1/3/1/4/131407164/pujup.pdf
    • http://files.mariannewardart.com/uploads/1/3/0/7/130775063/5304530.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9766/1348/files/82305116486.pdf
    • https://cdn.shopify.com/s/files/1/0435/5633/9871/files/vuluxalavol.pdf
    • https://cdn.shopify.com/s/files/1/0435/3441/8075/files/23823721645.pdf
    • https://cdn.shopify.com/s/files/1/0432/8839/5936/files/wesebezugajajefipozumoduj.pdf
    • https://cdn.shopify.com/s/files/1/0437/6412/1757/files/standard_tv_sizes.pdf
    • https://cdn.shopify.com/s/files/1/0429/8113/0394/files/1885876771.pdf
    • https://cdn.shopify.com/s/files/1/0429/3174/9031/files/acapella_rap_song.pdf
    • https://cdn.shopify.com/s/files/1/0437/6385/9617/files/the_law_of_confession_bill_winston.pdf
    • https://cdn.shopify.com/s/files/1/0432/0568/9499/files/divinity_original_sin_2_ps4_guide_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/1110/5183/files/wijenuji.pdf
    • https://cdn.shopify.com/s/files/1/0431/1741/2501/files/toviximoguboxowide.pdf
    • https://cdn.shopify.com/s/files/1/0430/9961/9492/files/numetapivu.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_off00006b2c.bin
f932c0d80c50ae5cc3f1874eefcf40a333aff94edb53c578a37d7891b25c1cf1
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B2C 5252 bytes
font_01_sfnt_off00007ce1.bin
c33ef3c78dcdf58fff0fe5ea976fcc0e4f2bfda5bca41e6e405e49a57e812aa1
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CE1 10104 bytes