Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf42519090c234d…

MALICIOUS

PDF

60.2 KB Created: 2020-07-26 18:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3551595047bad56083f13c24601754b6 SHA-1: 883ac4a51b8a6bbacd7659f583f167eb6ca3257c SHA-256: 5cf42519090c234ddb0bcca3037c604b131fd3f256163b03b6792372dc66b969
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this, indicating the document's primary purpose is to lead users to harmful sites. The presence of a large number of external PDF links, as flagged by 'PDF_SEO_LINK_FARM', suggests an attempt to manipulate search results or distribute content through a link farm, potentially for SEO poisoning or to obscure the malicious redirector.

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/wb?keyword=manual%20lavarropa%20eslabon%20de%20lujo%20awr%20680/3
    • http://files.ieperiostudyclub.com/uploads/1/3/1/4/131438443/4615168.pdf
    • http://files.outandplay.com/uploads/1/3/1/6/131606874/nirusafifalobudowux.pdf
    • http://files.burbagenews.co.uk/uploads/1/3/1/8/131856046/6aee38.pdf
    • http://files.kkcoreconnectionpilates.com/uploads/1/3/0/8/130873895/9681948.pdf
    • http://files.aviewoflondon.com/uploads/1/3/1/4/131407351/9d6c68a97451a5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1931/3062/files/58264118851.pdf
    • https://cdn.shopify.com/s/files/1/0431/2684/9700/files/dogede.pdf
    • https://cdn.shopify.com/s/files/1/0434/6842/3334/files/munolobakokupexujujili.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dosadibevejigavo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0152/0029/files/radubuzifuzuzotezi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56773010908.pdf
    • https://cdn.shopify.com/s/files/1/0429/2263/9527/files/26871035344.pdf
    • https://cdn.shopify.com/s/files/1/0432/2649/7182/files/napubitetepelijeda.pdf
    • https://cdn.shopify.com/s/files/1/0435/2730/7416/files/82249124978.pdf
    • https://cdn.shopify.com/s/files/1/0431/0587/8170/files/14250933938.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_off00009816.bin
85908f81d258c37f09dca02f74d5e1e1c184c9e8e888cd98a9e8bdec2b7b3d8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x9816 5772 bytes
font_01_sfnt_off0000abd2.bin
29378ef7da6038c869077d720b3bd1f1b5dbb02f6fecdc4f82eb562eab455378
pdf-font-stream PDF embedded font (sfnt) at offset 0xABD2 18292 bytes