Malicious PDF — malware analysis report

Static analysis result for SHA-256 76dcb8422a2c0dbc…

MALICIOUS

PDF

42.3 KB Created: 2020-08-30 11:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1db837a10667cf04a44acba1c3c474ef SHA-1: 4947fe8bd9642d02989b2f1cb632b19abe4b244e SHA-256: 76dcb8422a2c0dbcb6fab7366a7b4d46f5f22f7dc7c3d2adf561abeaedb827c3
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a link farm. One of these links, https://ttraff.cc/wix?keyword=id+qu%25C3%25AAte+skyrim, points to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body text is heavily obfuscated and appears to be largely junk data, but it does contain the malicious URL.

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.cc/wix?keyword=id+qu%25C3%25AAte+skyrim
    • https://static.usrfiles.com/ugd/12f4eb_790a532e19a243c89eaeb31858fcb8a9.pdf
    • https://static.usrfiles.com/ugd/6290de_122c9ed4358748929cde4175a521d448.pdf
    • https://static.usrfiles.com/ugd/b8c837_8d4ba40b1a6b4112bf25479cba565d0e.pdf
    • https://static.usrfiles.com/ugd/b8c837_98a330be0f8a412cbd134df2c0a42fea.pdf
    • https://static.usrfiles.com/ugd/b8c837_6b3c28caa47b4b82a743482ddadeec86.pdf
    • https://static.usrfiles.com/ugd/10b11f_157ef4c855d142678c7c9858e8b58283.pdf
    • https://static.usrfiles.com/ugd/b8c837_6f31e5b92342443bbf0fd6b95516c983.pdf
    • https://static.usrfiles.com/ugd/b8c837_7a9611631e2c47a1bae29aa0f52696d1.pdf
    • https://static.usrfiles.com/ugd/b8c837_3e1279d65a5043e0b0f3c7dd1854f029.pdf
    • https://cdn.shopify.com/s/files/1/0457/5651/4460/files/cpe_dihybrid_cross_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0440/2829/7381/files/59405382015.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/5989/files/xesuviwugotonos.pdf
    • https://cdn.shopify.com/s/files/1/0428/7945/1295/files/nijopefabiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sosivizugepu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7342/8888/files/kiguxijifawegetopebodevu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7140/6237/files/ziwubozevimububu.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_off00006478.bin
319e3a53e30dc99cd2cde4951d8b312d35cc1cda8bb3b419fcb2c0b4709cb74c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6478 5108 bytes
font_01_sfnt_off00007584.bin
f34ae432f633d7d816368a3edb092e88ccdfa61934ae2ffa231145e3e663d3a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x7584 11760 bytes