Malicious PDF — malware analysis report

Static analysis result for SHA-256 16151f83671142bb…

MALICIOUS

PDF

40.8 KB Created: 2020-08-30 12:41:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68d66d1ed2094b17f4c4e5b230051051 SHA-1: d77bd37ccd55d64dc5596930881d85fad1aa024b SHA-256: 16151f83671142bb0a9b695c8d0386d6a8f3705974ec2b6aab2ece8c94043c26
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector infrastructure, specifically 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL, suggesting an attempt to trick users into visiting a malicious site. 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/wix?keyword=o+pensamento+selvagem+claude+l%25C3%25A9vi-strauss+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/1c8c6c_1c8152eebd1547c19e216eb3fb93e3d7.pdf
    • https://static.usrfiles.com/ugd/b8c837_b4105a9085274f2aa15636327422548c.pdf
    • https://static.usrfiles.com/ugd/02beb7_b62b402ec9de41deb505c2d3a307add6.pdf
    • https://static.usrfiles.com/ugd/b8c837_55d9617a8c86423a9f1b3d48f3c18a84.pdf
    • https://cdn.shopify.com/s/files/1/0435/8589/6609/files/mujuvanadejugirul.pdf
    • https://cdn.shopify.com/s/files/1/0462/5884/7893/files/desktop_calendar_2019_free.pdf
    • https://cdn.shopify.com/s/files/1/0462/7372/4576/files/sweaty_betty_leggings_size_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/8866/7034/files/banojuwoze.pdf
    • https://cdn.shopify.com/s/files/1/0430/3493/5447/files/bed_sheet_sizes_canada_chart.pdf
    • https://cdn.shopify.com/s/files/1/0436/2004/0866/files/genujuge.pdf
    • https://cdn.shopify.com/s/files/1/0436/9865/1288/files/5947482669.pdf
    • https://cdn.shopify.com/s/files/1/0428/6310/0070/files/43700931810.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_off00005e97.bin
f50168b6b450bfd31d3d2656129c8f8229310874ba5c343c6e04e1b1062d6bab
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E97 5736 bytes
font_01_sfnt_off000071c5.bin
5dc901fd11752a5e9d214444401eb1bf4e08056d238a86f98993c8f578c9ff68
pdf-font-stream PDF embedded font (sfnt) at offset 0x71C5 10120 bytes