Malicious PDF — malware analysis report

Static analysis result for SHA-256 816e43c56d3d778d…

MALICIOUS

PDF

43.3 KB Created: 2020-08-29 06:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13785f226a234a6144b5f7db5c0bc48f SHA-1: 717f7af099fd9e71e1815ed213de9eb14afad2b2 SHA-256: 816e43c56d3d778dec22226dbb3b1171570eb87fe23833d61970a1bb5604af6e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a link farm with numerous embedded URLs, many of which point to benign content. However, one critical URL, 'https://ttraff.ru/wix?keyword=lord+of+the+rings+complete', is identified as a known malicious redirector. The ML classifier also flagged this PDF with high confidence. The document body appears to be obfuscated or corrupted, but the presence of the malicious redirector suggests an attempt to lead the user to malicious content.

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=lord+of+the+rings+complete
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8028/6372/files/68630639516.pdf
    • https://cdn.shopify.com/s/files/1/0444/3861/8278/files/1465146781.pdf
    • https://cdn.shopify.com/s/files/1/0431/6259/9585/files/amish_tripathi_books_in_malayalam.pdf
    • https://static.usrfiles.com/ugd/b8c837_df4ec144a90d42c696cb81b301af2f11.pdf
    • https://static.usrfiles.com/ugd/b8c837_00acb062bfc543c6a9ca7e70d00cd482.pdf
    • https://static.usrfiles.com/ugd/b8c837_409c019efa9f4aa28a7a617c0d06b294.pdf
    • https://static.usrfiles.com/ugd/b8c837_acd2b21d711d485d93ff7233026187c3.pdf
    • https://static.usrfiles.com/ugd/b8c837_1dccb9b98fc04a7bb503fab77e2589b6.pdf
    • https://static.usrfiles.com/ugd/b8c837_f5004c732a854fe490da7c63f88c82dd.pdf
    • https://static.usrfiles.com/ugd/b8c837_568298390be145088837aed6660c98ef.pdf
    • https://static.usrfiles.com/ugd/b8c837_057856fd00cf46b0805d026f0c1eec67.pdf
    • https://cdn.shopify.com/s/files/1/0431/1882/1530/files/business_plan_for_paper_recycling_project.pdf
    • https://cdn.shopify.com/s/files/1/0433/5566/8639/files/85372038369.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006979.bin
a71258d5e7265443c106d31e4364b1f96a2a90c9051a3f3de1262bdcf11aaa43
pdf-font-stream PDF embedded font (sfnt) at offset 0x6979 5300 bytes
font_01_sfnt_off00007b67.bin
552f2dc9ca4104b5975c050621f00778720c6fcebf084e7bbd389fa72fe6b593
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B67 11008 bytes