Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d9a686c644280b3…

MALICIOUS

PDF

46.1 KB Created: 2020-08-30 06:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b616c941f6467358f969e86e36d27b9e SHA-1: 31b76982fdccc495bbfe26bfcde63c8cec1cf1f8 SHA-256: 6d9a686c644280b35bbd1eeb588dbc057132da49a87c3ca75f586a9915c4c89e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a mass external link farm, with a primary URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the malicious URL and several other benign-looking PDF links, likely to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful 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=de+sonrisa+rene+y+georgette+magritte
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/8762/5369/files/82789053244.pdf
    • https://cdn.shopify.com/s/files/1/0430/8638/1210/files/31888226179.pdf
    • https://cdn.shopify.com/s/files/1/0433/7460/8545/files/jamowa.pdf
    • https://cdn.shopify.com/s/files/1/0435/1252/9055/files/toxuzavebowajipaxekedabe.pdf
    • https://static.usrfiles.com/ugd/5e8de6_1a0eb6a731904174afc456168e25cce2.pdf
    • https://static.usrfiles.com/ugd/98e298_c9cd167c686940e79a537a8cda37b44a.pdf
    • https://static.usrfiles.com/ugd/b8c837_8721ec39ed8242659ef8b3856c7e077f.pdf
    • https://static.usrfiles.com/ugd/90c678_a4a38f58cfd34ed3b211cc0610e23d11.pdf
    • https://static.usrfiles.com/ugd/01e791_b6f66ff7e207471b91d1be75514309c2.pdf
    • https://static.usrfiles.com/ugd/de65f7_7d9004f7768e448d8d073e0cd882da82.pdf
    • https://static.usrfiles.com/ugd/b8c837_a749f06352934335ae43fd715734e904.pdf
    • https://static.usrfiles.com/ugd/26938b_28b6dea5d41c4e9e909d77ecb07240ac.pdf
    • https://cdn.shopify.com/s/files/1/0439/4346/1032/files/ambulatory_ecg_report.pdf
    • https://cdn.shopify.com/s/files/1/0432/5883/9198/files/44606795211.pdf
    • https://cdn.shopify.com/s/files/1/0432/9812/8036/files/71531643531.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_off00007268.bin
8e0405a6ef432bb823c03863636ccf2688d64495a72f7e92a76e6f67375bf02f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7268 5076 bytes
font_01_sfnt_off0000839d.bin
1cf432ae4a0c0d1162db5d2acb85ed1da844ed50c6a02fa06b40b29a557c679a
pdf-font-stream PDF embedded font (sfnt) at offset 0x839D 11700 bytes