Malicious PDF — malware analysis report

Static analysis result for SHA-256 d54817d9afa3289e…

MALICIOUS

PDF

42.3 KB Created: 2020-08-14 20:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8c9a8b2b1852e791e40e244b6f8e110 SHA-1: d1b602353a8fff6ec97b436ef85a08e1608d2509 SHA-256: d54817d9afa3289ef4b7f086299d8e55c948257357ffc082642e997555a5b30c
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Capital investment appraisal excel template' and the malicious URL, suggesting a lure for financial scams. The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector indicates an attempt to lead the user to a malicious site.

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=capital+investment+appraisal+excel+template
    • http://mometa.pantanobaptistchurch.org/uploads/1/3/1/4/131483154/ee537ccd5ed0bde.pdf
    • http://files.lesboisbands.com/uploads/1/3/2/8/132814674/sukazejuxinojul.pdf
    • http://files.editorialmapale.com/uploads/1/3/2/6/132682630/xiromudamek-dujuloreresis-vagowukozil.pdf
    • https://cdn.shopify.com/s/files/1/0428/0975/3767/files/78727545008.pdf
    • https://cdn.shopify.com/s/files/1/0433/9879/1329/files/gubenasitulamarolenuju.pdf
    • https://cdn.shopify.com/s/files/1/0432/8787/1646/files/kofamujatijanumameru.pdf
    • https://cdn.shopify.com/s/files/1/0437/6831/6055/files/kigakugezomizenosuxap.pdf
    • https://cdn.shopify.com/s/files/1/0429/6101/0842/files/27049235705.pdf
    • https://cdn.shopify.com/s/files/1/0437/6579/2929/files/xovovuxupelojiwazesidozag.pdf
    • https://cdn.shopify.com/s/files/1/0434/0491/8941/files/nopizexuxobalewotunogas.pdf
    • https://cdn.shopify.com/s/files/1/0430/6203/4589/files/spanish_to_english_alphabet.pdf
    • https://cdn.shopify.com/s/files/1/0437/8161/9861/files/wiviworujo.pdf
    • https://cdn.shopify.com/s/files/1/0432/1506/1153/files/38136403490.pdf
    • https://cdn.shopify.com/s/files/1/0432/6083/8050/files/23617075513.pdf
    • https://cdn.shopify.com/s/files/1/0437/2440/6935/files/xuxozuvofadisupape.pdf
    • https://cdn.shopify.com/s/files/1/0429/9636/7511/files/4234588337.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_off00006854.bin
14b65a515a8f5b6025732d025177d6dda6cc1b51f948dce2ad141a36617e1829		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6854 5112 bytes
font_01_sfnt_off000079a5.bin
1f126fce72794c47e2161777f4e1cdb9376796311418fbfc9b724b2dfefb7f25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79A5 10148 bytes

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