Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa3fd4c0834e534…

MALICIOUS

PDF

45.5 KB Created: 2020-10-31 02:33:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d900e1f83f0b011a38a4c1bc86480c8d SHA-1: bdf013b0d09f9a71575a81b53e5f19cf1747c2b0 SHA-256: efa3fd4c0834e534e539705a182eef53b067cc4633095640a9f6936f74e7739a
154 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure and a link farm, indicating a malicious intent to direct users to harmful sites. The ML classifier strongly flagged this PDF as malicious. The presence of embedded URLs and the heuristic firings suggest this document is part of a phishing or malware distribution campaign.

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://ggtraff.ru/strik?keyword=boston+university+aba+509
    • https://newejata.weebly.com/uploads/1/3/3/9/133999860/362461.pdf
    • https://pidivupam.weebly.com/uploads/1/3/4/3/134327465/nikodori_xebil.pdf
    • https://tuvomirunasoz.weebly.com/uploads/1/3/4/3/134324776/laxegude.pdf
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/6890596.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/retobifulipo/674650628.pdf
    • https://s3.amazonaws.com/bezegoluzose/lisuxegi.pdf
    • https://cdn.shopify.com/s/files/1/0502/8177/5287/files/29691003878.pdf
    • https://s3.amazonaws.com/henghuili-files/erico_cadweld_molds.pdf
    • https://s3.amazonaws.com/vibove/kenekatitopetofodapiwabon.pdf
    • https://s3.amazonaws.com/fekaduvopigab/31115054010.pdf
    • https://cdn.shopify.com/s/files/1/0502/4812/2546/files/39_clues_doublecross_book_3.pdf
    • https://s3.amazonaws.com/tesotiwapax/52423158743.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_off000070e2.bin
b22a81b7fe0675aa663d609e6df1402b7457f582849f324b45a87d064f4e65d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70E2 5420 bytes
font_01_sfnt_off0000836a.bin
00c8633e2a83c1eee60660802d5793f0c1e0ab12739e7d66a562fa8cc6407027		 pdf-font-stream PDF embedded font (sfnt) at offset 0x836A 11052 bytes

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