Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c58d3b407a22c0a…

MALICIOUS

PDF

44.2 KB Created: 2020-08-11 20:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2eae5c4b55e5db3e5a3c2840d75aa42 SHA-1: ac34c35a866dc966a63d957f2126dd72251fa3ef SHA-256: 6c58d3b407a22c0a4203e42e104c0fc4c3373e7ad2ffe56dc2a8835e9f2d1e27
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 a redirector known to host malicious content. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to manipulate search engine results. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is intended to lead users to harmful websites.

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.cc/pify?keyword=multiplication+word+problems+worksheets+3rd+grade+pdf
    • http://files.beavercountytow.com/uploads/1/3/0/8/130874655/7591971.pdf
    • http://nolat.allielullart.com/uploads/1/3/2/7/132740214/3077013.pdf
    • http://galosaw.nohokaiproductions.com/uploads/1/3/1/4/131407668/sukepobejix.pdf
    • http://files.northeast7v7.com/uploads/1/3/2/6/132681352/4794326.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/4475/5866/files/great_expectations_oxford_bookworms.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45598155969.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/savowogofoxifonikili.pdf
    • https://cdn.shopify.com/s/files/1/0432/9000/1572/files/tuvuxefutoxezobu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7482/2044/files/roblox_gun_scripts.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/65069223210.pdf
    • https://cdn.shopify.com/s/files/1/0431/7007/0690/files/9078353643.pdf
    • https://cdn.shopify.com/s/files/1/0432/0182/2875/files/29279432793.pdf
    • https://cdn.shopify.com/s/files/1/0431/0152/0029/files/2153435099.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_off00006dcd.bin
0bf3c48a5bacdf9fa061a2d80e5956660f591d38d512f117a8459e5d2f95c3bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DCD 6032 bytes
font_01_sfnt_off0000823f.bin
85534906ccfbef3fcf6bca91970cc9f9db5310cd2e43ab9bb08cacb5d8ee93e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x823F 9876 bytes