Malicious PDF — malware analysis report

Static analysis result for SHA-256 05501f05598893f3…

MALICIOUS

PDF

35.6 KB Created: 2020-08-30 17:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4f430c91dad71f936b98609a15a8ff8 SHA-1: 9a0ef696c6e5bfcab569a341456405feed16efc6 SHA-256: 05501f05598893f35a2ba74428055f42f548808c53127a2756d3e7a4dacf0623
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, which is likely intended to lead the user to a malicious site or download. The document body, though heavily obfuscated, contains the same keyword found in the malicious URL, suggesting a lure. The presence of numerous other PDF links, many of which are benign, may be an attempt to blend in or to create a link farm.

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=san+diego+clairemont+dmv+driving+tes
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/63d3ad_6193b1ef7ebe443cbdcec61f2d9e7211.pdf
    • https://static.usrfiles.com/ugd/b8c837_588d24831d0d4f7ca37ccbc5fb22e7ae.pdf
    • https://static.usrfiles.com/ugd/b8c837_841d7999e8ec4fa0a094d048a8089940.pdf
    • https://static.usrfiles.com/ugd/0a593f_78ceee5b45b1496f9cfe5d3b5ac9396e.pdf
    • https://static.usrfiles.com/ugd/b8c837_019096de12f24e95a47cbc0fdde67012.pdf
    • https://static.usrfiles.com/ugd/87fdc7_0574c9fca9b64a8aa8931d2eced2c2c6.pdf
    • https://static.usrfiles.com/ugd/b8c837_455e295a74104e64b1b901251d27e431.pdf
    • https://static.usrfiles.com/ugd/b8c837_3cc6f02fb8b14d88ac3c5a7bb30b2a08.pdf
    • https://cdn.shopify.com/s/files/1/0439/1796/7528/files/xaputapeg.pdf
    • https://cdn.shopify.com/s/files/1/0441/2263/6440/files/aptitude_questions_and_answers_for_gate_exam.pdf
    • https://static.usrfiles.com/ugd/b8c837_4a4cee9358854ee29a3e77308ee60d54.pdf
    • https://static.usrfiles.com/ugd/b8c837_84a0b93aa568496e8e1fa3454ffecf22.pdf
    • https://static.usrfiles.com/ugd/696b8a_ff968651d4604b609185c3bc53576d86.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_off00004d28.bin
75203995c47d41ac8f1e0001b55c3cc143078d63a86535067455715bb25f8192
pdf-font-stream PDF embedded font (sfnt) at offset 0x4D28 5420 bytes
font_01_sfnt_off00005f7f.bin
0034c5d8b24cfc559744da57a08d63258c9df5df749c832db87727a09be14c7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F7F 10060 bytes