Malicious PDF — malware analysis report

Static analysis result for SHA-256 a00c75dce5428ce3…

MALICIOUS

PDF

33.1 KB Created: 2020-08-11 14:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae59ebfc0b8decef3345f742806806d6 SHA-1: 741958fb862366a044eca87770222075be3c9c64 SHA-256: a00c75dce5428ce300c5b92e5c9a7d50c1db98aebbeb9f9210179f6c6ac66b75
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 pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.ru'. This suggests the document is designed as a link farm to distribute traffic to malicious sites. The ML classifier also strongly indicated maliciousness.

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=aitsl+standards+pdf+highly+accomplished
    • http://files.purpleinkpublishing.com/uploads/1/3/1/4/131437844/mikofoxaxomojope.pdf
    • http://files.wordoflifealaska.com/uploads/1/3/1/4/131437117/b62aa4143b.pdf
    • http://tawipokub.bridgewanganui.com/uploads/1/3/1/4/131406202/bijiv.pdf
    • https://cdn.shopify.com/s/files/1/0430/3516/4835/files/remevaxadataj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0360/0283/files/jofudixawerewupo.pdf
    • https://cdn.shopify.com/s/files/1/0440/9081/8712/files/pdf_edit_multiple_pages_online.pdf
    • https://cdn.shopify.com/s/files/1/0436/2010/6404/files/xupujoxe.pdf
    • https://cdn.shopify.com/s/files/1/0432/1925/5454/files/laxojebovijoxabivebiga.pdf
    • https://cdn.shopify.com/s/files/1/0430/5354/7677/files/advance_directive_florida.pdf
    • https://cdn.shopify.com/s/files/1/0429/7677/2250/files/nitukova.pdf
    • https://cdn.shopify.com/s/files/1/0438/9135/9899/files/54641321628.pdf
    • https://cdn.shopify.com/s/files/1/0431/6132/1634/files/26980672349.pdf
    • https://cdn.shopify.com/s/files/1/0432/4841/8971/files/35159895827.pdf
    • https://cdn.shopify.com/s/files/1/0431/9805/4558/files/gelesekib.pdf
    • https://cdn.shopify.com/s/files/1/0434/3844/0598/files/10110792158.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_off00004439.bin
77d4ec7ccf6fbcc7f34629c67a263d6c407d38a26c02b87d6c9f3414e8c22a3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4439 5660 bytes
font_01_sfnt_off00005747.bin
f160e606a2342c3b504cfcf9d88ceb28b46175be578b53521e63ef48688a875b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5747 9412 bytes

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