Malicious PDF — malware analysis report

Static analysis result for SHA-256 52821f074c4dfd96…

MALICIOUS

PDF

45.2 KB Created: 2020-08-31 00:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b65fb177db9c6e72182340c809f10e5c SHA-1: e5f9769af18d1fe0efd95cdda461b91ec1a06b49 SHA-256: 52821f074c4dfd9674e05f9814f0a5d7ac29d2dbeacbdeb38b145dfdff970f93
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a download manager activation, aiming to trick users into clicking it. The document body and heuristics indicate a lure to external malicious infrastructure. The presence of a large number of external links suggests a link farm used for SEO poisoning or distributing further payloads.

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/wix?keyword=indirme+y%25C3%25B6neticisi+etkinle%25C5%259Ftirme
    • https://static.usrfiles.com/ugd/b8c837_baa8a104365144aca3b6f00fa7886710.pdf
    • https://static.usrfiles.com/ugd/b8c837_6699233d3e1c4fb0b4c37b4b2a6f4c88.pdf
    • https://static.usrfiles.com/ugd/dba42a_886cfcba4718450bac2c8cf88564e5a4.pdf
    • https://static.usrfiles.com/ugd/b8c837_3f47abcdb9904945a9c1c2bf44638d6d.pdf
    • https://cdn.shopify.com/s/files/1/0440/2338/2174/files/tropical_smoothie_nutrition.pdf
    • https://cdn.shopify.com/s/files/1/0437/2270/2999/files/nevemi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gamusuzojikifikukudubug.pdf
    • https://cdn.shopify.com/s/files/1/0436/0346/0259/files/wokukatevukikivelal.pdf
    • https://cdn.shopify.com/s/files/1/0441/2204/6616/files/mastic_asphalt_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/2962/6013/files/kunazu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6574/5303/files/38680666980.pdf
    • https://cdn.shopify.com/s/files/1/0431/7990/1085/files/entrepreneurship_k12.pdf
    • https://cdn.shopify.com/s/files/1/0431/9150/0961/files/64903108159.pdf
    • https://cdn.shopify.com/s/files/1/0431/5843/8039/files/portada_the_economist_2020_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0430/7373/2768/files/83289944885.pdf
    • https://cdn.shopify.com/s/files/1/0432/2649/7182/files/pmp_exam_prep_8th_edition.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_off00007110.bin
3ccbadfd391e75a9f78ad4885cad408fd4402cd37e84d63d1d0d650656d0c63e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7110 5364 bytes
font_01_sfnt_off00008289.bin
5fc63f4ce30139de7b0f5017bb6d28fe993adc60c1e4ef636ab1a0ed088d43f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8289 11440 bytes

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