Malicious PDF — malware analysis report

Static analysis result for SHA-256 83edfac2596f6943…

MALICIOUS

PDF

32.1 KB Created: 2020-08-24 08:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8198db8c4f33b0802030817c2380127 SHA-1: fb7ef3b680756b6343ee9af0132f0956585b7480 SHA-256: 83edfac2596f694340bfde8b7b639f2b0d7035d8c82f6758c1eae17c2fa27357
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=atro+chatro+comedy+video'. Additionally, it exhibits a PDF link farm behavior with numerous external links, including one to a potentially malicious Shopify URL. The ML classifier also strongly flagged this PDF as malicious. These indicators suggest the document's primary purpose is to lure users to malicious infrastructure, 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/pify?keyword=atro+chatro+comedy+video
    • http://files.marinwoodturningandcompany.com/uploads/1/3/1/3/131379678/04b1ce7d6ae.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/4979/4213/files/dobuleri.pdf
    • https://cdn.shopify.com/s/files/1/0429/5720/9753/files/4563985400.pdf
    • https://cdn.shopify.com/s/files/1/0430/8611/9079/files/mefunevedutojal.pdf
    • https://cdn.shopify.com/s/files/1/0435/7960/5147/files/farmakokinetik_antasida.pdf
    • https://cdn.shopify.com/s/files/1/0430/4499/5221/files/lisere.pdf
    • https://cdn.shopify.com/s/files/1/0437/6592/3992/files/51388037753.pdf
    • https://cdn.shopify.com/s/files/1/0435/6410/5886/files/24106899654.pdf
    • https://cdn.shopify.com/s/files/1/0437/5671/6183/files/aprender_portugues_1_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0434/9588/2918/files/calculus_7th_edition_stewart_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/5316/1367/files/uva_darden_employment_report.pdf
    • https://cdn.shopify.com/s/files/1/0437/0271/4533/files/jusuzuwew.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_off0000428c.bin
ebf90826ae83fe18a13862423d0a43081496b7f7345e4040fd9516f3d19f9099
pdf-font-stream PDF embedded font (sfnt) at offset 0x428C 5120 bytes
font_01_sfnt_off000053d9.bin
ca1c7b6a0d0a40204001fbb38dfa2b73a520113d8c0b6f40cc0ff536ed006d76
pdf-font-stream PDF embedded font (sfnt) at offset 0x53D9 9408 bytes