Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b43596932e698ba…

MALICIOUS

PDF

33.3 KB Created: 2020-08-17 05:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6a341e017a5a44744a6e59cec2811da SHA-1: 4628a54bbf606c026a48c364e3986c81cfb14157 SHA-256: 6b43596932e698bab0040f08114c47e53873d163534df3b5e59e80140359cceb
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, including a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms the presence of a malicious redirector, and 'PDF_SEO_LINK_FARM' indicates a large number of external links. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to drive traffic to malicious infrastructure.

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=crash+bandicoot+android+emulator
    • http://files.crispusattucksalumnilettermen.com/uploads/1/3/0/7/130740391/wapenitodebi.pdf
    • http://files.sitesofpassage.org/uploads/1/3/1/0/131071240/455213.pdf
    • http://files.caribbeanpsyarts.com/uploads/1/3/1/4/131437987/0c470a891690c1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2137/7434/files/41623474369.pdf
    • https://cdn.shopify.com/s/files/1/0434/1121/0398/files/zidexoso.pdf
    • https://cdn.shopify.com/s/files/1/0429/6648/3103/files/24961708657.pdf
    • https://cdn.shopify.com/s/files/1/0431/3019/2039/files/13160390395.pdf
    • https://cdn.shopify.com/s/files/1/0433/9993/8211/files/english_dictionary_pronunciation_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57955619809.pdf
    • https://cdn.shopify.com/s/files/1/0435/6302/4542/files/16223384719.pdf
    • https://cdn.shopify.com/s/files/1/0427/8580/0358/files/rawenibabaf.pdf
    • https://cdn.shopify.com/s/files/1/0443/8360/0806/files/anarcho_syndicalism.pdf
    • https://cdn.shopify.com/s/files/1/0431/6961/1930/files/juwenerudugix.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_off00004492.bin
64ef876483445874b682544c9640aa9de5f78475e7b14b02644205ae45e1226a
pdf-font-stream PDF embedded font (sfnt) at offset 0x4492 5224 bytes
font_01_sfnt_off0000561c.bin
bfa8df0d6d2f331ca97ee3b3f2267dad46415adeb8416159eba31acaf6432bf3
pdf-font-stream PDF embedded font (sfnt) at offset 0x561C 10060 bytes