Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b5d05edcab1855…

MALICIOUS

PDF

42.8 KB Created: 2020-09-14 12:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0124f2aae99730deb8b2625d26adde6b SHA-1: 2e11829a51a50691797297e4b503a2846d7eb275 SHA-256: f6b5d05edcab18556b62e28e93dab5926b18be8634837d08a1df3a0b7e7249b7
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to benign Shopify URLs, but one critical link directs to a known malicious redirector at 'ttraff.com'. This suggests a social engineering attempt to lure the user to malicious infrastructure under the guise of providing document answers. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=chapter+4+atomic+structure+wordwise+answers
    • http://files.faithbaptistchurchministries.net/uploads/1/3/1/4/131453540/3094470.pdf
    • http://www.nclark.net/Atom
    • https://cdn.shopify.com/s/files/1/0464/8632/3352/files/pltw_cea_equation_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0465/9291/7669/files/turbo-charged_prelude_2003_online_fr.pdf
    • https://cdn.shopify.com/s/files/1/0435/0204/3288/files/edward_said_out_of_place.pdf
    • https://cdn.shopify.com/s/files/1/0432/1991/0811/files/96845955676.pdf
    • https://cdn.shopify.com/s/files/1/0439/2783/0696/files/tf2_the_classic.pdf
    • https://cdn.shopify.com/s/files/1/0431/7839/3762/files/48440019854.pdf
    • https://cdn.shopify.com/s/files/1/0428/3888/4519/files/store_receipt_voucher_template.pdf
    • https://cdn.shopify.com/s/files/1/0432/6454/0840/files/ballroom_blitz_tab.pdf
    • https://cdn.shopify.com/s/files/1/0437/8073/5138/files/73977079348.pdf
    • https://cdn.shopify.com/s/files/1/0435/1731/3176/files/wojupolok.pdf
    • https://cdn.shopify.com/s/files/1/0431/2242/6013/files/16719155105.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_off00006800.bin
dc511cefc81650a4e9212af6fb06a03c00dfc8d135e0d41939830f35d880bbd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6800 5364 bytes
font_01_sfnt_off00007a28.bin
7cde99091e345d396ffcee1360a1ceb0858e438d0ac6aa38a914127ec7c2bea4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A28 10680 bytes

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