Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b3d1185ca32632…

MALICIOUS

PDF

44.9 KB Created: 2020-08-06 06:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2cfc175d5f52be6b76ceff9ae6d99e1 SHA-1: b14a45a9a318f131ca1a7345416ad97ba602e6e2 SHA-256: 79b3d1185ca326329f8974ee72c9cef2dac1d610f963e654dc558caaf28b0157
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many hosted on cdn.shopify.com. The document body, though partially corrupted, contains the same redirect URL and a benign-looking PDF filename, suggesting a lure to trick users into clicking the malicious link. No scripts were extracted, but the primary attack vector appears to be social engineering via a malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=br%25C3%25BCche+addition+subtraktion+pdf
    • http://files.kyeemaridge.com/uploads/1/3/1/3/131382330/2979508.pdf
    • http://files.wisdomforwarriors.com/uploads/1/3/0/8/130814980/4aae0c8efeeecc8.pdf
    • http://files.schec.net/uploads/1/3/1/8/131871894/6851944.pdf
    • http://files.mindpractice.it/uploads/1/3/1/8/131856271/4118360.pdf
    • https://cdn.shopify.com/s/files/1/0432/6935/7728/files/pilukafavewufudutup.pdf
    • https://cdn.shopify.com/s/files/1/0429/6055/2085/files/43531695216.pdf
    • https://cdn.shopify.com/s/files/1/0437/5887/8872/files/15011879443.pdf
    • https://cdn.shopify.com/s/files/1/0437/0278/0072/files/terraria_creative_mode_mod.pdf
    • https://cdn.shopify.com/s/files/1/0434/4443/7142/files/direct_tv_rebate_form_online.pdf
    • https://cdn.shopify.com/s/files/1/0433/9741/5077/files/refejobukugejumasezikarip.pdf
    • https://cdn.shopify.com/s/files/1/0429/6045/3785/files/povonetokizudinupafufav.pdf
    • https://cdn.shopify.com/s/files/1/0428/1240/7967/files/parimizexosovudavol.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/7997453156.pdf
    • https://cdn.shopify.com/s/files/1/0437/4134/7994/files/77553466236.pdf
    • https://cdn.shopify.com/s/files/1/0432/0791/7729/files/contrato_administrativo_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0432/1063/7475/files/10307728497.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_off00006c9d.bin
7c4459ab76115f2159889b3bc017b9c9a04dd6a1e1dea3ae02963de215de5346
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C9D 5584 bytes
font_01_sfnt_off00007f5a.bin
5b13cc75f828d577ce658f07efeced2e9251f409a4a332ec326adf97936821ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F5A 11172 bytes