Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5045151f9dd4c43…

MALICIOUS

PDF

45.7 KB Created: 2020-08-31 04:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 282db2aaa668fc3d3d94e5718d26d4c4 SHA-1: 5a1dff0992a78bc9640a3f15eed8ba0528becb54 SHA-256: d5045151f9dd4c434210d5cb1f35f8ee479c252a46f9d4cec8f1c7d80732fad0
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a high number of embedded links. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.ru/wix?keyword=schwinn+240+recumbent+bikes'. Another critical heuristic indicated a PDF link farm, with many links pointing to Shopify and static.usrfiles.com domains, suggesting a potential SEO manipulation or content distribution scheme. The document body contains garbled text and a few URLs, but the primary malicious activity appears to be the extensive linking.

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.ru/wix?keyword=schwinn+240+recumbent+bikes
    • https://cdn.shopify.com/s/files/1/0429/1058/0902/files/resezozoxi.pdf
    • https://cdn.shopify.com/s/files/1/0460/0424/0543/files/92515248453.pdf
    • https://cdn.shopify.com/s/files/1/0434/1094/8254/files/formule_arrondi_au_suprieur_excel.pdf
    • https://cdn.shopify.com/s/files/1/0438/7084/7131/files/outils_de_menuisier_ancien.pdf
    • https://cdn.shopify.com/s/files/1/0432/1270/1860/files/43342702756.pdf
    • https://static.usrfiles.com/ugd/b8c837_2bcb0b902e1a4dbcb0bfe0b9d88f5f2d.pdf
    • https://static.usrfiles.com/ugd/409ca8_a932d1f541dc4bd0940a855c38dc4e64.pdf
    • https://static.usrfiles.com/ugd/73c254_fbf87cb1ffc34da4b5ceb027112b2b63.pdf
    • https://static.usrfiles.com/ugd/b8c837_6f20a658b6594a728d1e632be534843f.pdf
    • https://static.usrfiles.com/ugd/451461_9decaf14358a42b5b6d09ce69e59d52b.pdf
    • https://static.usrfiles.com/ugd/455f95_1a00ff173aa84af681a0c9012ff24082.pdf
    • https://static.usrfiles.com/ugd/2e79a6_b235862f93f14a5b960ab1ac4141513a.pdf
    • https://static.usrfiles.com/ugd/a31856_acf8f32378f348a09cb561d056ed563b.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9f18cad06e041a6baedb4428c042c3d.pdf
    • https://static.usrfiles.com/ugd/b8c837_2b0b0bfba6b743bebedf975decc995d1.pdf
    • https://static.usrfiles.com/ugd/b8c837_c21f99e7162d4716ba4de2ede43cec1f.pdf
    • https://static.usrfiles.com/ugd/cf79db_53f8ce8c08b54fbc8d85709640efab2b.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_off000074ae.bin
60034b770c58045ce3c2d877da3c94571c60410f13fdd0ebb9aaec9732f042f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74AE 5556 bytes
font_01_sfnt_off00008779.bin
dd576c423c1db5ec59b4097d2d6ae560089ec0340cd2d4d622413742323f1d0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8779 10148 bytes

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