Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e62e371dc388a20…

MALICIOUS

PDF

36.5 KB Created: 2020-08-30 14:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45c1e0a54ece8eae8987325fdf52a9e5 SHA-1: 0af3a839e68cbe10255e394d7447816abf6ddc64 SHA-256: 6e62e371dc388a200dd6b38f5bf79cc9d3277961cd73db61f7e51f50d919aef8
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector infrastructure, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body also contains a large number of external PDF links, suggesting a link farm for SEO manipulation or to obscure malicious destinations. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs points towards a phishing or redirection attempt.

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=libros+del+rincon+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/1634/8057/files/75713398414.pdf
    • https://cdn.shopify.com/s/files/1/0433/7215/0947/files/bank_secrecy_act_1970.pdf
    • https://cdn.shopify.com/s/files/1/0428/4396/3548/files/kezurigivafazaditipuwepu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9390/0958/files/authoritative_parenting_style.pdf
    • https://static.usrfiles.com/ugd/c0fca2_ccb978183b26490d8226963947367892.pdf
    • https://static.usrfiles.com/ugd/4f270c_beac971e62e34af3afe9d3f09590e906.pdf
    • https://static.usrfiles.com/ugd/003b86_93de085b1fbc4ded8fddc2ba856cc97f.pdf
    • https://cdn.shopify.com/s/files/1/0431/4890/2556/files/tezenowope.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/android_wear_os_app_development.pdf
    • https://cdn.shopify.com/s/files/1/0431/6381/2002/files/la_caverna_de_platon_nigel_warburton.pdf
    • https://cdn.shopify.com/s/files/1/0434/5213/7622/files/87734343735.pdf
    • https://cdn.shopify.com/s/files/1/0434/8667/5108/files/eu_bioeconomy_strategy.pdf
    • https://cdn.shopify.com/s/files/1/0432/7417/4622/files/safakugawotawu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004458.bin
df342dbcb522ccff5eb9a676192e46420defade2703c02001429b38da9167a78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4458 4728 bytes
font_01_sfnt_off00005459.bin
84bf26ff64e8796e68f60a3a18e16c84dfb805d2212f7b1cf8b3eb17b99980d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5459 10740 bytes
font_02_sfnt_off0000777d.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x777D 4324 bytes

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