Malicious PDF — malware analysis report

Static analysis result for SHA-256 661547a29ea06f9c…

MALICIOUS

PDF

36.1 KB Created: 2020-09-01 09:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14900b8e7327c8b2f680e3b6a79a97a0 SHA-1: 92808f79300d3c712437112abc3438405f75126c SHA-256: 661547a29ea06f9c5737b193f170d5c9579a216b4d42bb9a7a9c748adf175fe0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, many of which point to a link farm designed to generate SEO traffic. One of the primary links, 'https://ttraff.ru/wix?keyword=groundsheets+for+sale+western+cape', is flagged as a known malicious redirector. The document's content is minimal and appears to be a lure to encourage link clicks.

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=groundsheets+for+sale+western+cape
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/2074c9_1a8ded89f81d456ea3f5350486ef8147.pdf
    • https://static.usrfiles.com/ugd/b6edda_a6d9585a14de4a0da9a9de22c9129c80.pdf
    • https://static.usrfiles.com/ugd/32777b_f066843df43948e4bfb8bd579a56b8f4.pdf
    • https://static.usrfiles.com/ugd/ea9bdf_58cbaad625944f17a493cf47771b702b.pdf
    • https://cdn.shopify.com/s/files/1/0432/4678/0566/files/69134305474.pdf
    • https://cdn.shopify.com/s/files/1/0430/8385/8073/files/wininuwufugapokexusob.pdf
    • https://cdn.shopify.com/s/files/1/0435/0397/6614/files/analog_to_digital_audio_converter.pdf
    • https://cdn.shopify.com/s/files/1/0427/3196/2535/files/timex_indiglo_wr_50_m.pdf
    • https://cdn.shopify.com/s/files/1/0437/3417/1800/files/opera_mini_app_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0430/2598/9785/files/36054541678.pdf
    • https://cdn.shopify.com/s/files/1/0430/8025/3593/files/91216183750.pdf
    • https://static.usrfiles.com/ugd/4d6844_17453a6d59c148dd9683f4061bd92974.pdf
    • https://static.usrfiles.com/ugd/1be480_268ad91208814d2da8347b8d3c10924f.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004efd.bin
8ff0412a0208ce65a7789c7bfcf83e9f125c8b2c0ddd31ac2b1c828b06196e38
pdf-font-stream PDF embedded font (sfnt) at offset 0x4EFD 5368 bytes
font_01_sfnt_off00006154.bin
dc88c8fee804a7bb162c62532c067f7a07c01de76b3e9b2e4a42a35e6a474728
pdf-font-stream PDF embedded font (sfnt) at offset 0x6154 10120 bytes