Malicious PDF — malware analysis report

Static analysis result for SHA-256 03f08bab1bd1743b…

MALICIOUS

PDF

43.3 KB Created: 2020-08-25 16:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71a78f848d18a2159be57ad209a899bd SHA-1: 349769b33501295abe0db0304f7673e397a74125 SHA-256: 03f08bab1bd1743bd136f1598d29590f9e6cf9ec9f869e72d9bdcf4e3d04e83c
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 potentially malicious redirector infrastructure. One prominent link, disguised as an 'Autodesk uninstall tool', leads to `https://ttraff.cc/pify?keyword=autodesk+uninstall+tool+2016`, a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous links suggests a link farm or SEO poisoning attempt to distribute malware.

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=autodesk+uninstall+tool+2016
    • http://zuwulo.kathryns-beaded-jewelry.com/uploads/1/3/1/6/131637814/a0565089c4e47.pdf
    • http://files.sarasotacommunitychurch.org/uploads/1/3/0/9/130969053/9c78f1d.pdf
    • http://nugijoki.mwavizi.org/uploads/1/3/1/8/131871825/4a81d.pdf
    • http://mufab.swanpottery.com/uploads/1/3/0/8/130813841/pogezeg.pdf
    • http://vuzifoji.mustlovedogs2.com/uploads/1/3/1/4/131406069/wagufidilixube.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0459/2635/0999/files/akoam_apk_android.pdf
    • https://cdn.shopify.com/s/files/1/0464/6902/1846/files/kurik.pdf
    • https://cdn.shopify.com/s/files/1/0431/2642/3701/files/mefupedakur.pdf
    • https://cdn.shopify.com/s/files/1/0439/4038/0840/files/maintenance_replacement_and_reliability_theory_and_applications.pdf
    • https://cdn.shopify.com/s/files/1/0432/8656/0936/files/ginuke.pdf
    • https://cdn.shopify.com/s/files/1/0434/5842/9089/files/bluebird_bukowski.pdf
    • https://cdn.shopify.com/s/files/1/0437/2611/0885/files/bawimewofok.pdf
    • https://cdn.shopify.com/s/files/1/0433/0238/7867/files/ragapuxasejek.pdf
    • https://cdn.shopify.com/s/files/1/0430/0436/2906/files/38642837657.pdf
    • https://cdn.shopify.com/s/files/1/0431/0423/9783/files/ford_501_sickle_mower_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/9999/4778/files/38081101659.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_off00006a97.bin
b6b49a13255efe8bb6993aff58fd20f74f198daef30c2f895f817d0a0f44a172		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A97 5256 bytes
font_01_sfnt_off00007c8a.bin
7f4bc71d3192f69e34252f60853543ed4bd5a7dcdce22598b33c97fdba130839		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C8A 10492 bytes

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