Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ee08b26a2195b8…

MALICIOUS

PDF

47.0 KB Created: 2020-08-18 22:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7898b39b291f54798bf770949b9ab7b SHA-1: 6479af0b4ce5d28135d6ffddeca96ea58810a02d SHA-256: 37ee08b26a2195b83c12831cb6224d37c697de08de48a1829372eefe2e43a057
150 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, disguised as information about Canada Post envelope sizes. The PDF also contains a large number of external links, many of which point to potentially malicious or unknown domains. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's part of a link farm designed to distribute malicious content.

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.ru/pify?keyword=canada+post+envelope+size+guidelines
    • http://titadax.withvsat.com/uploads/1/3/1/4/131438641/9fed0.pdf
    • http://files.aubreybethphotography.com/uploads/1/3/0/9/130969695/4560737.pdf
    • http://files.reformationfarms.com/uploads/1/3/2/6/132680901/2ba1609a281129.pdf
    • http://mariziw.professorplayground.com/uploads/1/3/1/4/131406665/pawopurusoxawo.pdf
    • https://cdn.shopify.com/s/files/1/0434/2503/8497/files/33924132640.pdf
    • https://cdn.shopify.com/s/files/1/0428/7456/8860/files/75583449883.pdf
    • https://cdn.shopify.com/s/files/1/0430/4610/9341/files/81030627987.pdf
    • https://cdn.shopify.com/s/files/1/0427/8134/3900/files/life_insurance_meaning_and_importance.pdf
    • https://cdn.shopify.com/s/files/1/0439/8442/1022/files/uworld_step_3.pdf
    • https://cdn.shopify.com/s/files/1/0428/7594/5113/files/tegudubuge.pdf
    • https://cdn.shopify.com/s/files/1/0431/8789/6488/files/lurolax.pdf
    • https://cdn.shopify.com/s/files/1/0430/9889/8592/files/59386928953.pdf
    • https://cdn.shopify.com/s/files/1/0446/5518/1987/files/bionaire_egg_air_purifier_manual.pdf
    • https://cdn.shopify.com/s/files/1/0440/2633/1286/files/wefipaba.pdf
    • https://cdn.shopify.com/s/files/1/0432/0044/6626/files/tixinuwujovom.pdf
    • https://cdn.shopify.com/s/files/1/0434/4286/4289/files/63257428028.pdf
    • https://cdn.shopify.com/s/files/1/0438/1966/3517/files/60897974415.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_off00007b3a.bin
a162549a06c43c8b54ce6f57be3bb7e0337487440543ec8996e1dd1cec43c145		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B3A 5044 bytes
font_01_sfnt_off00008c86.bin
1aa8647ec199d7b7b175318e36096a9d0b55253c8e8b189c19be41de91e799dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C86 10128 bytes

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