Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dae20817f5c0b6c…

MALICIOUS

PDF

40.3 KB Created: 2020-08-24 07:39:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d844f631f2540a10e6fc70000bc531da SHA-1: f71a2c2a0335a937aad8109a46f5e17a3f036d2a SHA-256: 5dae20817f5c0b6cf9fd31f4986e24fceb2cbfce2a24d08cb9bdbef7f81760d2
194 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 (ttraff.com) and other external sites. This behavior is indicative of a link farm designed to distribute traffic to various destinations, potentially for SEO manipulation or to host malicious content. The presence of a password-protected archive lure heuristic suggests an attempt to bypass security controls by encrypting a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.com/pify?keyword=tipos+de+caries+en+ni%25C3%25B1os+pdf
    • http://kavoxawi.annranderaadpottery.com/uploads/1/3/1/4/131437987/1740535.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/60739539363.pdf
    • https://cdn.shopify.com/s/files/1/0433/0966/2366/files/zuxatikenubo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0860/5859/files/modopapatitujin.pdf
    • https://cdn.shopify.com/s/files/1/0429/9603/9839/files/que_es_el_acta_constitutiva.pdf
    • https://cdn.shopify.com/s/files/1/0463/2736/5789/files/adobe_analytics_report_builder.pdf
    • https://cdn.shopify.com/s/files/1/0450/7769/2581/files/manuel_pour_apprendre_le_franais.pdf
    • https://cdn.shopify.com/s/files/1/0437/7922/7810/files/73210540047.pdf
    • https://cdn.shopify.com/s/files/1/0433/8991/1194/files/98090497007.pdf
    • https://cdn.shopify.com/s/files/1/0437/5281/6798/files/rixegedemalalepopef.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6976/files/cbr1000rr_2015_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/8676/4446/files/udp_tracker._thepornvilla._com_6969_announce.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_off00005d85.bin
98ac73987079f96327409445e5a4a7e73c9fcf5fb0bd15240c8ebe5f0588a6a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D85 5280 bytes
font_01_sfnt_off00006f39.bin
3d6bc70f92948bf2340207388c3b3aaa12f8991a1f832f947977b7c9727c18a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F39 11096 bytes