Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd21205cbb5bbde8…

MALICIOUS

PDF

42.5 KB Created: 2020-08-12 04:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bc511fe5cd32e617f2b457251cb33f4 SHA-1: f0ff50e765420d6315355203a9b0f40b82399ab5 SHA-256: bd21205cbb5bbde8209e73727039d782105f52107e29e530f0aea269e4b6b9d7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links, one of which, 'https://ttraff.com/pify?keyword=formative+assessment+and+summative+assessment+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'formative assessment and summative assessment pdf' and references wkhtmltopdf, suggesting a lure document. The presence of numerous other PDF links, many pointing to suspicious domains, indicates a link farm or redirection strategy. The ML classifier strongly flagged this PDF as malicious.

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.com/pify?keyword=formative+assessment+and+summative+assessment+pdf
    • http://duzowi.doinaalexei.com/uploads/1/3/1/8/131857920/6d61fc2a11433.pdf
    • http://files.jazzdbell.com/uploads/1/3/1/3/131384663/3778707.pdf
    • http://files.mountbiggs.school.nz/uploads/1/3/0/8/130815381/2d61c42e0.pdf
    • http://files.momentum-matters.com/uploads/1/3/0/8/130813111/6714976db20db7a.pdf
    • https://cdn.shopify.com/s/files/1/0433/4754/2175/files/29677374545.pdf
    • https://cdn.shopify.com/s/files/1/0433/7238/0310/files/silid.pdf
    • https://cdn.shopify.com/s/files/1/0433/6379/5094/files/9325212413.pdf
    • https://cdn.shopify.com/s/files/1/0427/6856/4380/files/80481555370.pdf
    • https://cdn.shopify.com/s/files/1/0435/8792/8223/files/bohr_sommerfeld_theory_of_hydrogen_atom.pdf
    • https://cdn.shopify.com/s/files/1/0435/9972/4702/files/73453636005.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/tuwevirakajik.pdf
    • https://cdn.shopify.com/s/files/1/0435/7370/6913/files/the_meat_buyer_s_guide_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/2240/9125/files/wotanibojexevidafaxodogil.pdf
    • https://cdn.shopify.com/s/files/1/0435/1547/8176/files/28490986627.pdf
    • https://cdn.shopify.com/s/files/1/0432/1542/1600/files/jopun.pdf
    • https://cdn.shopify.com/s/files/1/0430/9195/1769/files/unholy_dk_bis.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069b8.bin
f4ed0e3dd7168854157f3268b4813484412d8e3af41b67a02aa60cf1907b0ed2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69B8 5172 bytes
font_01_sfnt_off00007b39.bin
9b485850aef5b3e99a1c7642915f99a8492d4725177829dabe0fa67a7822ae19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B39 9860 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.