Malicious PDF — malware analysis report

Static analysis result for SHA-256 361346989e4a2bfe…

MALICIOUS

PDF

36.9 KB Created: 2020-08-31 15:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7361d8dd376a919aeb1dce47e7d8f5c SHA-1: e2972f29ede24ba6e0f1acf028905e68699a540f SHA-256: 361346989e4a2bfe3b6c67ab02250e42fd74c63d543d4eb3af2848d3b983f479
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to Shopify-hosted PDF files, suggesting a link farm. One of these links, https://ttraff.ru/wix?keyword=games+wala+play+store, is identified as a known malicious redirector. The ML classifier also flagged this PDF as malicious. The document body contains garbled text but includes the malicious URL and several benign URLs.

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=games+wala+play+store
    • https://cdn.shopify.com/s/files/1/0434/6275/4461/files/92092936965.pdf
    • https://cdn.shopify.com/s/files/1/0440/8089/0008/files/neratopipibewumaxaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/4141/4552/files/derarok.pdf
    • https://cdn.shopify.com/s/files/1/0431/0836/8545/files/nezugopek.pdf
    • https://static.usrfiles.com/ugd/eb4c03_20ea44ba09ec4875bf04e2f40ac9444c.pdf
    • https://static.usrfiles.com/ugd/b8c837_24cb71bbbc564c1cbb2561a0e2439c05.pdf
    • https://static.usrfiles.com/ugd/b8c837_4bb2d338c05a46798132c10f46895a33.pdf
    • https://static.usrfiles.com/ugd/b8c837_204a331194f440838d8c927d2a2c01f9.pdf
    • https://static.usrfiles.com/ugd/5af86b_4be32b9c745c47389b2a86b312d6c54f.pdf
    • https://cdn.shopify.com/s/files/1/0430/8333/3785/files/karan_arjun_film_hd.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7880/files/rotupuxubu.pdf
    • https://cdn.shopify.com/s/files/1/0428/4229/2390/files/76318790113.pdf
    • https://cdn.shopify.com/s/files/1/0438/2123/6384/files/75170125941.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_off0000538a.bin
29f4b8663c3b71112ce96518f771405481f9c97a40fecdc29ec14a663ca2952a
pdf-font-stream PDF embedded font (sfnt) at offset 0x538A 5192 bytes
font_01_sfnt_off00006534.bin
b45977e1b5646e70c843d793fa1ff7426bdd5a26ce2f6f2358bfc7e5123f0e75
pdf-font-stream PDF embedded font (sfnt) at offset 0x6534 9864 bytes