Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ebd16baf0d2a16b…

MALICIOUS

PDF

47.0 KB Created: 2020-08-07 12:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4fc4fe7dc6aba1316b1a18820f38523f SHA-1: 25fd87c0f4fd738e427041f99e0e4944110b36f1 SHA-256: 5ebd16baf0d2a16bdaf14f57eb34b61cf1c4b3a7bfd8371eac53379347a17e54
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 link farm designed to redirect users to malicious content. The primary redirector URL is identified as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially harmful websites, 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.ru/pify?keyword=learning+styles+pdf+2020
    • http://files.jemun.net/uploads/1/3/1/4/131437538/zimef-pafitakimu-kazuwapofi-xefulogekasa.pdf
    • http://files.logancyclingclub.org.au/uploads/1/3/1/8/131857717/008ffe57.pdf
    • http://files.eastcoastvintagemx.com/uploads/1/3/0/8/130814466/1338480.pdf
    • http://files.nyegirlboutique.com/uploads/1/3/1/8/131871817/078a2c8860f026.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1659/3312/files/zexezopemamivurifelilo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9930/7678/files/gazeririgeduwabifopoku.pdf
    • https://cdn.shopify.com/s/files/1/0438/5266/0901/files/famoki.pdf
    • https://cdn.shopify.com/s/files/1/0434/7448/5401/files/dallas_cowboy_schedule.pdf
    • https://cdn.shopify.com/s/files/1/0432/0644/3163/files/71720920462.pdf
    • https://cdn.shopify.com/s/files/1/0436/0952/2339/files/xolunatuwimovemu.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/1278623472.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/99045720647.pdf
    • https://cdn.shopify.com/s/files/1/0427/9762/9596/files/13974759734.pdf
    • https://cdn.shopify.com/s/files/1/0435/9038/5823/files/40383804659.pdf
    • https://cdn.shopify.com/s/files/1/0430/3526/3138/files/jadojitukuvozu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9476/1877/files/paxasedivulijuvunirerola.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_off00007871.bin
5ee5d864e9c5912b43c4829993e2ad25647673d68b44bb10a3ae84305b42bee4
pdf-font-stream PDF embedded font (sfnt) at offset 0x7871 5524 bytes
font_01_sfnt_off00008b5a.bin
516fa128615ab6ab1c544d5b0aa77f273a3e49f72e594facb8275e133ad52da5
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B5A 10444 bytes