Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcbf67e12c4aa63b…

MALICIOUS

PDF

54.5 KB Created: 2020-07-24 03:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f64e4b71be40a60163de70c86f750fa SHA-1: 21d4a70f97b9fb363be48ba9d3696753fdcd417d SHA-256: dcbf67e12c4aa63b51f1e58da8f44ddeefad32d35715aa3f88051cfa376015d6
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains multiple embedded links, with one pointing to a known malicious redirector (ttraff.com). The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create documents for SEO spam or phishing lures. The presence of numerous links, many hosted on cdn.shopify.com, suggests a link farm or a method to obscure the ultimate 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.com/pify?keyword=census+report+of+assam+1951
    • http://files.soundviewhomeinspections.com/uploads/1/3/1/4/131452823/7302261.pdf
    • http://files.iobcwa.org/uploads/1/3/1/3/131382680/luwubebezi.pdf
    • http://files.wazobiaarts.com/uploads/1/3/2/6/132681295/rivelugoxosejip-silixunuluta-pijaxizaze.pdf
    • http://files.elocuentecollections.com/uploads/1/3/1/4/131407737/jamesimuvo.pdf
    • http://files.westgeorgiaballoonandparty.com/uploads/1/3/0/8/130813111/46cdd1806d.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8758/files/76488133927.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pekazojifedabefotekufof.pdf
    • https://cdn.shopify.com/s/files/1/0429/3358/4028/files/zovogafesejixutodafasiniw.pdf
    • https://cdn.shopify.com/s/files/1/0439/3569/5016/files/zuzisojidodinivititatuxez.pdf
    • https://cdn.shopify.com/s/files/1/0432/3511/5175/files/lixorujeniviralojo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9041/9620/files/75634054880.pdf
    • https://cdn.shopify.com/s/files/1/0433/2145/8853/files/lefolejubiv.pdf
    • https://cdn.shopify.com/s/files/1/0430/1701/1353/files/tififunitedomor.pdf
    • https://cdn.shopify.com/s/files/1/0428/8082/7558/files/51955810009.pdf
    • https://cdn.shopify.com/s/files/1/0432/9888/1704/files/4751016317.pdf
    • https://cdn.shopify.com/s/files/1/0429/6278/0311/files/83097518189.pdf
    • https://cdn.shopify.com/s/files/1/0429/3096/2588/files/popimibasosazuvo.pdf
    • https://cdn.shopify.com/s/files/1/0437/2132/6742/files/mukoviwuwuxasixupowote.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_off00009776.bin
80ec9de097c2880822eb3fcd5ddf6a436851baf525ae76e4c7a9c3b87b592a0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9776 5204 bytes
font_01_sfnt_off0000a913.bin
f2994672f22cbac1e14ec6d6ba860c81a19e83a31228686ce22af0d669e42e6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA913 10484 bytes

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