Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0d99d6943ce4bc4…

MALICIOUS

PDF

44.6 KB Created: 2020-07-29 13:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a886f3811e631ca3bae1f280189453b7 SHA-1: 14c010286a15353c9216cbb95a6850b6ebe718fc SHA-256: b0d99d6943ce4bc4b4387585d99828d2785964ee5b19b88ab6ae920e750e36c1
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, appears to be a lure related to 'Seismic reflection interpretation pdf'. The presence of a link farm and a high ML classifier score further support malicious intent. No scripts were extracted, but the PDF structure itself is used for malicious redirection.

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.ru/pify?keyword=seismic+reflection+interpretation+pdf
    • http://files.dewittcountyfarmbureau.com/uploads/1/3/1/0/131070481/ziboxupag.pdf
    • http://files.gretapope.com/uploads/1/3/1/4/131453512/xiwudin.pdf
    • http://files.smlworld.co.uk/uploads/1/3/1/3/131383586/42ef8.pdf
    • http://files.chelseyfitfactory.com/uploads/1/3/1/3/131383650/gejezutabixamo_jifidebiz_dewolewekalapa_zepedo.pdf
    • http://files.chelseyfitfactory.com/uploads/1/3/1/3/131383650/gejezutabixamo_jifidebiz_de
    • https://cdn.shopify.com/s/files/1/0439/7400/0798/files/29773218356.pdf
    • https://cdn.shopify.com/s/files/1/0428/3518/1724/files/45832662455.pdf
    • https://cdn.shopify.com/s/files/1/0430/2707/1130/files/95324500199.pdf
    • https://cdn.shopify.com/s/files/1/0432/0781/9422/files/96574971256.pdf
    • https://cdn.shopify.com/s/files/1/0433/2149/1621/files/17690066271.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5476/files/zafovefuvib.pdf
    • https://cdn.shopify.com/s/files/1/0430/7845/1351/files/siwogijaxenokezasajis.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/13160330876.pdf
    • https://cdn.shopify.com/s/files/1/0433/6310/6968/files/76024350820.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/88490435411.pdf
    • https://cdn.shopify.com/s/files/1/0438/0947/2669/files/7735878420.pdf
    • https://cdn.shopify.com/s/files/1/0428/3075/8054/files/lasaxitiwobaxusimasinebu.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_off000070dd.bin
55a56715c50c0bdb31467e19a611d8d0a1e4a92eb2fc04f6e140be74d458eda7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70DD 5192 bytes
font_01_sfnt_off00008256.bin
88c54df4d2fc25032b2112828661e3f743a4fa5b59e27939f0dbed6affcafd12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8256 10180 bytes

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