Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fde21e9a0f286b8…

MALICIOUS

PDF

45.9 KB Created: 2020-08-30 01:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da272346e687407780098fb049d829ac SHA-1: 56ec5fe3fe0da5480819e5ee8ea5e10663d89e3b SHA-256: 4fde21e9a0f286b88011b7be514270cfddd07b532ae73118945ca22ddee2d663
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to a 'shop map' and the malicious URL. The presence of numerous PDF links, many hosted on Shopify and static.usrfiles.com, suggests a link farm or redirection strategy to distribute malicious content. The ML classifier also strongly indicated maliciousness.

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.com/wix?keyword=jersey+gardens+shop+map
    • https://cdn.shopify.com/s/files/1/0428/4393/0791/files/pezepapuwewazegevivu.pdf
    • https://cdn.shopify.com/s/files/1/0427/6856/4380/files/8913043926.pdf
    • https://cdn.shopify.com/s/files/1/0431/6181/3152/files/36919163447.pdf
    • https://cdn.shopify.com/s/files/1/0465/0195/3688/files/wobokopu.pdf
    • https://cdn.shopify.com/s/files/1/0440/8875/4328/files/14576755146.pdf
    • https://cdn.shopify.com/s/files/1/0431/0410/8711/files/81576509092.pdf
    • https://static.usrfiles.com/ugd/cd79e3_cecd571769ed4bc39dc3203a36fd0956.pdf
    • https://static.usrfiles.com/ugd/b8c837_cfcda2e4e5bd4a3d8b7503cf0da89f99.pdf
    • https://static.usrfiles.com/ugd/b8c837_11734de3b77c411581461eb84533a23e.pdf
    • https://static.usrfiles.com/ugd/4b7290_d2791b7562d24509869f068c03d26945.pdf
    • https://static.usrfiles.com/ugd/b65acf_ec0f5ad25f544546bfecf03b17bf980e.pdf
    • https://static.usrfiles.com/ugd/a2ebd8_d0ffe0dd220441b0bb89c37e29affd35.pdf
    • https://static.usrfiles.com/ugd/b8c837_262dcc061e1848c591642610cf1cd397.pdf
    • https://static.usrfiles.com/ugd/374ce0_2e65fddac78c4cc5ad974a0030ac3a83.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_off00006984.bin
58d6aeb2c7e90ef4853956011869e28dd92c6ca8b2c664f5660ffe32e8a639b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6984 5432 bytes
font_01_sfnt_off00007bd0.bin
886ec537bc6b88d70a67d8d9cafa61f13c8eef187eff0992980e1c47ac22190b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BD0 15220 bytes