Malicious PDF — malware analysis report

Static analysis result for SHA-256 88bcf2dd30b2fb35…

MALICIOUS

PDF

44.4 KB Created: 2020-07-08 19:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f7f2a8cbb38532e4535255f93f202bf SHA-1: 9a8689bbd541ce86fcfb0e88fc1630c7d675e43d SHA-256: 88bcf2dd30b2fb35fdc787485f8cf117036dfd7bac26433d74b9f0a712948dc9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors. The primary malicious link identified is https://ttraff.ru/wb?keyword=pressure%20die%20casting%20defects%20pdf, which is a known malicious redirector. The document body, though heavily obfuscated, contains similar keywords and URLs, reinforcing the lure of information about 'pressure die casting defects' to entice users to click the malicious links.

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=pressure%20die%20casting%20defects%20pdf
    • http://files.jhwolfanger.com/uploads/1/3/1/8/131857818/3249006.pdf
    • http://files.squareonegoodsco.com/uploads/1/3/2/8/132815154/tasawaz.pdf
    • http://files.hoosiertrappersupply.com/uploads/1/3/1/8/131872285/056fbe2.pdf
    • http://files.arizonalife.rocks/uploads/1/3/2/6/132681450/xufajabal_sapadu_durewalek_rulozepewi.pdf
    • http://files.oleanfoodpantry.org/uploads/1/3/1/3/131384071/zapuzederadum-sogotixeroj.pdf
    • http://files.techtrekfriend.com/uploads/1/3/1/1/131163932/vumowajofap.pdf
    • http://files.artcollectivefrederick.com/uploads/1/3/0/8/130814237/papagupomimemodizug.pdf
    • https://wimokudijo.files.wordpress.com/2020/07/woxep.pdf
    • https://daxujuga.files.wordpress.com/2020/06/zekitituxi.pdf
    • https://rogafoxozi.files.wordpress.com/2020/07/47481308074.pdf
    • https://dufaxuxed.files.wordpress.com/2020/06/gaxakejedudumusor.pdf
    • https://vegumakelaj.files.wordpress.com/2020/06/wijemu.pdf
    • https://fimesijonoba.files.wordpress.com/2020/06/kasubekuxalarat.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69440205977.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bobidaxida.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rasebiv.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071b5.bin
d09d538056a400ef03272e5907fc53fbfdf9cfd800a55c0bae30becc8c934f00
pdf-font-stream PDF embedded font (sfnt) at offset 0x71B5 5064 bytes
font_01_sfnt_off000082f6.bin
d9bfa27d7932d2db8ab8a8f820f8c39c558069be308013bba0ea4ed0aeed3fcc
pdf-font-stream PDF embedded font (sfnt) at offset 0x82F6 9912 bytes