Malicious PDF — malware analysis report

Static analysis result for SHA-256 2505fb56e942f975…

MALICIOUS

PDF

60.9 KB Created: 2020-09-01 01:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32d86cfb42fdd1ea844972be2fe91988 SHA-1: 427afddbdba82727cbfe037333bf14849c4c35b0 SHA-256: 2505fb56e942f9756716550d5713d454c2b5daf0d49e82dcd920556de4538570
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'certificate template design background' and the malicious URL. This suggests a phishing or social engineering attack aiming to redirect the user to a malicious site. The ML classifier strongly supports the malicious nature of this PDF.

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=certificate+template+design+background
    • https://cdn.shopify.com/s/files/1/0432/3701/5719/files/tegajugasip.pdf
    • https://cdn.shopify.com/s/files/1/0431/1187/4716/files/67318364863.pdf
    • https://cdn.shopify.com/s/files/1/0437/2345/6666/files/36586873980.pdf
    • https://static.usrfiles.com/ugd/b50c55_0f3b66d81a5d4595aeb1126231e3394c.pdf
    • https://static.usrfiles.com/ugd/b8c837_4de5e67f14e94c7e8dc57bb5a917e810.pdf
    • https://static.usrfiles.com/ugd/7e0eb0_c85a6d589e1c44fdb40bf79424c0556a.pdf
    • https://static.usrfiles.com/ugd/97493d_774ddb8553b649268b51b2465f875d71.pdf
    • https://static.usrfiles.com/ugd/4c76bf_18973b5136d34c6ab028dcd07940dc6a.pdf
    • https://cdn.shopify.com/s/files/1/0427/9821/9420/files/nedisogirexubemoxo.pdf
    • https://cdn.shopify.com/s/files/1/0427/7311/9143/files/bewojilumetuxutelani.pdf
    • https://cdn.shopify.com/s/files/1/0437/2683/1784/files/83761538770.pdf
    • https://cdn.shopify.com/s/files/1/0438/6396/5861/files/react_native_android_change_bundle_id.pdf
    • https://cdn.shopify.com/s/files/1/0431/1253/0081/files/5801054800.pdf
    • https://cdn.shopify.com/s/files/1/0440/0444/2262/files/26068294457.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_off0000aef0.bin
2ae1eecaa3164ba3f74e9c8d5f32647602f89ad723a8d7c89a38751748022b4c
pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF0 5584 bytes
font_01_sfnt_off0000c1d2.bin
3e3e8c54222415302624ffef5e5ecffb9d24693825eb453bd218c8693c9734bb
pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D2 10788 bytes