Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a54a1e5252e6bdf…

MALICIOUS

PDF

36.0 KB Created: 2020-08-13 16:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 223edbfe8cdc6d70f6f01983183fa726 SHA-1: 4e1597e3742b243d1aecf15d6ef8cf9926a4b71c SHA-256: 5a54a1e5252e6bdf4bfd61881c43d4f6f5231105d107588edc08d01e61499653
154 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, also contains URLs that appear to be part of a link farm designed to attract search engine traffic. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector suggests an attempt to lead users to harmful content.

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.ru/wb?keyword=huion%20h610%20pro%20manual
    • http://files.airn.ca/uploads/1/3/0/7/130775013/sapofojiwevineg.pdf
    • http://files.bcmeccanomodellers.com/uploads/1/3/1/4/131406473/tejipamiri.pdf
    • http://files.patradolk.com/uploads/1/3/2/6/132682124/d925d1864b3.pdf
    • http://files.montevistalacrosse.com/uploads/1/3/2/6/132681315/jamedam_wafefe_mazep_navefuvub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/0271/4536/files/calligraphy_practice_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/4956/6886/files/pogalusomolasowik.pdf
    • https://cdn.shopify.com/s/files/1/0433/5671/7224/files/diferencias_entre_anestesia_epidural_y_raquidea.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45865267400.pdf
    • https://cdn.shopify.com/s/files/1/0433/6399/1717/files/2178494761.pdf
    • https://cdn.shopify.com/s/files/1/0431/4103/8229/files/94926631097.pdf
    • https://cdn.shopify.com/s/files/1/0434/1530/6405/files/75153982451.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/tokotatulokanividaxexidos.pdf
    • https://cdn.shopify.com/s/files/1/0431/0263/4148/files/99039211352.pdf
    • https://cdn.shopify.com/s/files/1/0435/8055/5419/files/noroxixejofozofig.pdf
    • https://cdn.shopify.com/s/files/1/0433/9548/1750/files/wisunawoguvivaxuzubal.pdf
    • https://cdn.shopify.com/s/files/1/0437/1975/3879/files/define_collective_bargaining_agreement.pdf
    • https://cdn.shopify.com/s/files/1/0430/5181/0969/files/83590348215.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_off00004f83.bin
2ce11503744ddad287311ad09e4634ffd12cc65f0463c3015efd11cf83857fd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F83 5188 bytes
font_01_sfnt_off000060f4.bin
dce716e722e3e15616fb2a7bff939ecff01ffd6f381664a8929b67ed0a1e26fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60F4 10216 bytes

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