Malicious PDF — malware analysis report

Static analysis result for SHA-256 04693964bcaab729…

MALICIOUS

PDF

42.8 KB Created: 2020-08-10 02:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 062fbb329b151b3a0d3627d565c2dece SHA-1: 2ca70ddae79f78fe38531e8a9ef553d99295c7de SHA-256: 04693964bcaab72961643a629cddd4539a0c0b5814b1f18a76f3b198672b2088
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The document body itself is heavily obfuscated but contains URLs that appear to be part of a link farm designed to manipulate search engine results and lure unsuspecting users to malicious sites. No scripts were extracted, but the presence of numerous malicious links strongly suggests a phishing or redirection attack.

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/pify?keyword=cbr+test+astm+pdf
    • http://files.trotr.org/uploads/1/3/0/7/130775982/38484b592de.pdf
    • http://files.centralfloridarowing.com/uploads/1/3/1/4/131437655/debodob-rupuvagarapi.pdf
    • http://files.itsmydayspecialevents.net/uploads/1/3/1/4/131437318/3296374.pdf
    • http://files.robertmeyerlaw.com/uploads/1/3/1/3/131383613/8093979.pdf
    • http://wemilu.takakohasegawa.net/uploads/1/3/1/4/131409090/8375875.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9856/1948/files/brusters_menu.pdf
    • https://cdn.shopify.com/s/files/1/0427/9812/1119/files/printable_english_grammar_exercises_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0436/9340/8409/files/madurujawirusijuzevitexat.pdf
    • https://cdn.shopify.com/s/files/1/0431/7298/7046/files/jefaxagudek.pdf
    • https://cdn.shopify.com/s/files/1/0435/3861/2378/files/46851167818.pdf
    • https://cdn.shopify.com/s/files/1/0433/4750/9416/files/pubg_server_status.pdf
    • https://cdn.shopify.com/s/files/1/0434/4233/9992/files/ramab.pdf
    • https://cdn.shopify.com/s/files/1/0429/9181/2767/files/brain_teaser_interview_questions_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/8377/5643/files/python_filter_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0432/1103/0683/files/mutovob.pdf
    • https://cdn.shopify.com/s/files/1/0431/0158/5570/files/lubeta.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mipin.pdf
    • https://cdn.shopify.com/s/files/1/0428/9023/1974/files/66854670227.pdf
    • https://cdn.shopify.com/s/files/1/0430/3699/9842/files/alfabeto_em_ingles.pdf
    • https://cdn.shopify.com/s/files/1/0428/0143/0695/files/tisaruma.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_off00006b86.bin
469fd1ad2599ff3a9b7e5afa78ed4450e5e03a7204f13b6a321b9d6cf4b14b33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B86 5200 bytes
font_01_sfnt_off00007d0e.bin
04e3a88c774d1cd4042010cba3d4019c63184fa63ddc87c868f427a49837eabf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D0E 9720 bytes

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