Malicious PDF — malware analysis report

Static analysis result for SHA-256 681b9e7a527aa802…

MALICIOUS

PDF

49.8 KB Created: 2020-08-21 19:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf8d663a249b4cace6d8c651dbe10930 SHA-1: 640be131718399fd08372006b0b4a4c10daf64c7 SHA-256: 681b9e7a527aa8024f9532eeed1908f2c046cd87eb74d3a16f3a2a024cd55b37
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, appears to contain the target URL. The presence of a link farm and a redirector suggests an attempt to lure users to malicious sites, 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.com/pify?keyword=analytical+writing+gre+format
    • http://jixupaw.eastsidesportsanalysis.com/uploads/1/3/0/7/130775403/jomaje.pdf
    • http://fewuwez.pldmeadowlands.com/uploads/1/3/0/8/130874431/6406805.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/7738/6918/files/capitals_and_currencies_of_important_countries.pdf
    • https://cdn.shopify.com/s/files/1/0437/4416/6037/files/worksheet_clock.pdf
    • https://cdn.shopify.com/s/files/1/0439/3415/4907/files/cooling_tower_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0428/9714/6019/files/radamunobetavuwafel.pdf
    • https://cdn.shopify.com/s/files/1/0429/0147/1388/files/kazipusuwa.pdf
    • https://cdn.shopify.com/s/files/1/0437/5373/4298/files/bible_yoruba.pdf
    • https://cdn.shopify.com/s/files/1/0433/9197/5580/files/gamila.pdf
    • https://cdn.shopify.com/s/files/1/0430/9460/5975/files/apache_tomcat_8_installer_exe.pdf
    • https://cdn.shopify.com/s/files/1/0434/9689/8724/files/adwords_mobile_certification_study_guide.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_off000086cd.bin
f79592e50be76fb718999fc19510c4dbed807835ca28e7df14483b7b220ab19f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86CD 5204 bytes
font_01_sfnt_off00009882.bin
98719e4a1655b1ed55eef3b7a8b5d12250b48194f92b1fd174181c9dc1490ad7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9882 10120 bytes

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