Malicious PDF — malware analysis report

Static analysis result for SHA-256 771fb06b407c26d5…

MALICIOUS

PDF

74.6 KB Created: 2020-08-07 16:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 723a3a641c45fdf6681c43fb02eeaca9 SHA-1: cc6ce26a74824b11fda7906d85ef985d0da1730c SHA-256: 771fb06b407c26d50d42867bbe5b3311bf5966436d6cc4a19577f9d3fef26f81
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure related to machine learning PDFs, and the presence of embedded URLs points towards an attempt to redirect users to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=no%25C3%25A7%25C3%25B5es+de+aprendizado+de+m%25C3%25A1quina+pdf
    • http://files.chen-lu.co/uploads/1/3/2/6/132681501/9771806.pdf
    • http://files.networkhearing.net/uploads/1/3/1/4/131453256/witumar_zuxovatofeme_nataromeba.pdf
    • http://files.alldonemarketing.com/uploads/1/3/0/7/130775221/3822325.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/3706/4344/files/gesiwosifibaposano.pdf
    • https://cdn.shopify.com/s/files/1/0436/1597/7630/files/managing_oneself_by_peter_f._drucker.pdf
    • https://cdn.shopify.com/s/files/1/0431/1243/1776/files/morisulumamanedozazuvojid.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sarexomerowomowubufo.pdf
    • https://cdn.shopify.com/s/files/1/0436/4291/2926/files/livro_barra_de_access_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0429/9368/0547/files/rozirobumeregixun.pdf
    • https://cdn.shopify.com/s/files/1/0427/8406/3654/files/pokemon_platinum_rare_candy_codes.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lipowu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8977/2190/files/95107988491.pdf
    • https://cdn.shopify.com/s/files/1/0431/1128/4893/files/josof.pdf
    • https://cdn.shopify.com/s/files/1/0434/1946/7943/files/jinutumolojazusekuga.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_off0000d014.bin
156d108a9155e9fe7aed81fbb494aa9085273f6c307c1f53be627186c33d1f20		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD014 5736 bytes
font_01_sfnt_off0000e2ab.bin
2e40a1afbf07daebeb518c319b902fb8ad969d22251980620ecafcdcf3c6111d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AB 13948 bytes
font_02_sfnt_off00010cfe.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFE 4324 bytes

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