Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2177cf99d904e5e…

MALICIOUS

PDF

38.9 KB Created: 2020-08-31 00:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10f1c79dccb45b1d55da2bf3e5dd40ec SHA-1: bfd4c9ca23c8ed16d3e0088110827d832c2ff235 SHA-256: d2177cf99d904e5e35512576af429d06e35b6113ffe1e3f68ed68985d9b6ef91
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links to other PDF documents, a technique often used for SEO manipulation or to obscure malicious content. One of these links, 'https://ttraff.ru/wix?keyword=yihi+sx+mini+g+class+manual', is identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated.

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=yihi+sx+mini+g+class+manual
    • https://static.usrfiles.com/ugd/b98abb_f16dc38588f24fb694c9c10136ce3457.pdf
    • https://static.usrfiles.com/ugd/b8c837_359dc12d085e49c8826b8f229258dde3.pdf
    • https://static.usrfiles.com/ugd/b8c837_cb6f0d2e3f224ffdbc54b9370b056c71.pdf
    • https://static.usrfiles.com/ugd/77d535_216818e4c21d405c9921015680aa2526.pdf
    • https://static.usrfiles.com/ugd/b8c837_283e40783a034a528e2f92a6d43a4b39.pdf
    • https://static.usrfiles.com/ugd/e2f7e1_55b1e86dd8aa4a67bea97dbcdd1953c0.pdf
    • https://static.usrfiles.com/ugd/565485_12a6d5d8ef744fdc9fb9b0a07da046b9.pdf
    • https://static.usrfiles.com/ugd/2b3f46_6b3f47face604966878222e4399667d2.pdf
    • https://cdn.shopify.com/s/files/1/0430/6577/0135/files/nutewuzif.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81274949660.pdf
    • https://cdn.shopify.com/s/files/1/0432/8026/9477/files/42201663957.pdf
    • https://cdn.shopify.com/s/files/1/0430/6278/8245/files/wivigodofuve.pdf
    • https://cdn.shopify.com/s/files/1/0438/0744/1053/files/xivasafovofuxe.pdf
    • https://cdn.shopify.com/s/files/1/0439/1839/3499/files/xovobatolus.pdf
    • https://cdn.shopify.com/s/files/1/0433/3725/3023/files/sand_casting_steps.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_off000057ed.bin
3f32ddcae2e5f3bebe7f80e78dc9c70c0d4211aecc91110043103168123ddc34
pdf-font-stream PDF embedded font (sfnt) at offset 0x57ED 5148 bytes
font_01_sfnt_off00006948.bin
93654fbdc606673e12c992226112cef34975d9714968c0b4fd9f91c2ef4fda8b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6948 11540 bytes