Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d103d563b22812…

MALICIOUS

PDF

42.6 KB Created: 2020-08-31 11:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c99c0eb97724708c8b35494888736d28 SHA-1: ca1002bba84191cf85bfc08c6c81b2b5bca4405c SHA-256: 28d103d563b228128b7c8104dea294180dbed79500107e92744d01b34a76715d
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a large number of external links, with one pointing to a known malicious redirector. The document body is heavily obfuscated but contains a URL that matches the malicious redirector. The presence of a link farm suggests an attempt to lure users to malicious content.

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.com/wix?keyword=central+focus+edtpa
    • https://static.usrfiles.com/ugd/b8c837_3e866402209b4a83b948a68f0bf0a07d.pdf
    • https://static.usrfiles.com/ugd/455f95_53a91f7845314e0888a4b82cbe3df948.pdf
    • https://static.usrfiles.com/ugd/9c0842_c28e77a8dd384851a3e19b8229e5fece.pdf
    • https://static.usrfiles.com/ugd/a76634_ff776ee1798a4ad48ae63e864a8c209f.pdf
    • https://cdn.shopify.com/s/files/1/0431/5011/4965/files/certificado_medico_cruz_roja.pdf
    • https://cdn.shopify.com/s/files/1/0431/0908/9447/files/convert_to_word_with_ocr_online_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/3124/8541/files/87342975065.pdf
    • https://cdn.shopify.com/s/files/1/0431/0581/2629/files/wokolaxug.pdf
    • https://static.usrfiles.com/ugd/b8c837_d57a875f48484ecb9c7ba2770793a251.pdf
    • https://static.usrfiles.com/ugd/5899d5_cb4b0ba57fb046ffa510f2005378247b.pdf
    • https://static.usrfiles.com/ugd/b8c837_664249c81da44ab2969ba9e06293e833.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b9f.bin
1e0fe0a26aeba63efbf046f1eeae2196b3ed1627eecb07d421fefa7468d88a14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B9F 5052 bytes
font_01_sfnt_off00007cd4.bin
155c1486c53142bf60339a4416019710592bd5a5083b69cfb8419a3dcf36bbca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CD4 9612 bytes

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