Malicious PDF — malware analysis report

Static analysis result for SHA-256 85de7ba18e031aa2…

MALICIOUS

PDF

33.3 KB Created: 2020-08-07 10:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 733bbd661a614fad48abf9399f539329 SHA-1: ea76242c78d451570dfb13dad5bad6a7a1be1186 SHA-256: 85de7ba18e031aa2f9c376d4e88564cb7fda64952c0c200bda26a53a66274177
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a link farm infrastructure designed to redirect users to malicious content. The primary redirector URL is `https://ttraff.cc/wb?keyword=classifying%20australian%20animals%20worksheet`, which is flagged as malicious. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links strongly suggest an attempt to lead the user to a malicious site, likely for phishing or malware distribution.

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/wb?keyword=classifying%20australian%20animals%20worksheet
    • http://files.roxieriverawriter.com/uploads/1/3/1/3/131378771/ripib.pdf
    • http://files.heritageheroesptsa.org/uploads/1/3/1/0/131070378/0a34c625b.pdf
    • http://files.damascusbaptistchurch.org/uploads/1/3/1/1/131164281/povoso_gepawisonut_simonirixomu.pdf
    • http://files.broughtoncambridgeshire.com/uploads/1/3/1/4/131453214/dewutekesizu.pdf
    • http://files.petercosimoleather.com/uploads/1/3/0/9/130969002/4226024.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5358/8390/files/966459587.pdf
    • https://cdn.shopify.com/s/files/1/0431/6889/1040/files/764225240.pdf
    • https://cdn.shopify.com/s/files/1/0429/4321/7830/files/conjunction_of_time_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/8642/9861/files/19803254500.pdf
    • https://cdn.shopify.com/s/files/1/0428/3006/9927/files/human_heart_system.pdf
    • https://cdn.shopify.com/s/files/1/0433/1739/5611/files/salanokimumotiwis.pdf
    • https://cdn.shopify.com/s/files/1/0428/2882/4742/files/mimul.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/81988232477.pdf
    • https://cdn.shopify.com/s/files/1/0429/6481/1935/files/bekotobesanamifekorozikan.pdf
    • https://cdn.shopify.com/s/files/1/0427/8288/4006/files/welarep.pdf
    • https://cdn.shopify.com/s/files/1/0440/3278/6597/files/wowoj.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_off000045b0.bin
92ae2830d856989474b254839308a2de61ea2422b5cb39575b1b6999e97c7378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x45B0 5344 bytes
font_01_sfnt_off000057c9.bin
6bb2621414ce87850b0d243c99b000488995a9f1dd383513aecd52f44ba86dda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57C9 9468 bytes

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