Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa26fa91aff6bd5…

MALICIOUS

PDF

41.5 KB Created: 2020-08-10 22:40:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9936b61297011f8223a999357fd28195 SHA-1: 18f3c5befcbd1f7fbba27583b52d0be8d9c42e56 SHA-256: 5fa26fa91aff6bd556cecd697fd2abb0c4bdddaab77b6eaa0b0a17dd05fe720b
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 external PDF files, indicating a link farm designed to manipulate search engine results or distribute content. One of the primary links, 'https://ttraff.cc/pify?keyword=hq+caverna+do+drag%25C3%25A3o+final+pdf+download', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness.

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=hq+caverna+do+drag%25C3%25A3o+final+pdf+download
    • http://files.strongagriculturalsociety.com/uploads/1/3/1/1/131163533/bunojazananij-salit.pdf
    • http://daziwitu.crime-fighters.com/uploads/1/3/0/8/130813528/gifozibulubibumepofe.pdf
    • http://files.farmsteadsmith.com/uploads/1/3/0/8/130813645/3809378.pdf
    • http://kitov.wigandcandle.com/uploads/1/3/2/7/132740405/6052902.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1682/2692/files/24235850621.pdf
    • https://cdn.shopify.com/s/files/1/0432/7201/1931/files/95298300261.pdf
    • https://cdn.shopify.com/s/files/1/0432/8495/5300/files/leave_of_absence_letter_sample.pdf
    • https://cdn.shopify.com/s/files/1/0433/3230/5054/files/guxukazesuri.pdf
    • https://cdn.shopify.com/s/files/1/0434/5865/8454/files/46791160344.pdf
    • https://cdn.shopify.com/s/files/1/0428/8479/2479/files/xasorukofujum.pdf
    • https://cdn.shopify.com/s/files/1/0431/8950/2111/files/toponimovuleguzowi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1324/2005/files/gawepafikobenadifimabo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8341/5204/files/18338490065.pdf
    • https://cdn.shopify.com/s/files/1/0437/4190/5057/files/the_duff_online.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58097506778.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004cc6.bin
e50f3291aec50128a35bcc4f76a9328c53b762b05464177aa0583280fe2b1dd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CC6 5704 bytes
font_01_sfnt_off00005faf.bin
a1efb67eed7a99f0e80c257f6b7d1c9ad7a5d5bc3919f84973624581226f1d5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FAF 9776 bytes
font_02_sfnt_off000080d8.bin
04b30c2f2a8018c7583bcbc57b73eccbfb80cfa1e5a2d096ee4f0652c1212bf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80D8 16320 bytes

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