Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c1ffaace52d89bb…

MALICIOUS

PDF

45.9 KB Created: 2020-08-22 03:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8286861bf7bd2b6a50a46b0f2b2b10e SHA-1: 11ba6f6cfd61cfe848b4875e568e7ba573afa655 SHA-256: 4c1ffaace52d89bb2351dc33050de4a9c2a428b6d5368140dbe8f5c67b5ff086
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one prominent link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'cobia fishing report virginia' and the malicious URL. This suggests a phishing lure designed to redirect users to malicious infrastructure.

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=cobia+fishing+report+virginia
    • http://files.thehistoriansquarterly.com/uploads/1/3/1/4/131453733/renojunilimelek.pdf
    • http://tajop.williamsburgnaz.org/uploads/1/3/0/8/130814124/720a18cdc24.pdf
    • https://cdn.shopify.com/s/files/1/0431/2013/2247/files/centrifugal_pump_efficiency.pdf
    • https://cdn.shopify.com/s/files/1/0461/5412/1379/files/newborn_assessment_procedure.pdf
    • https://cdn.shopify.com/s/files/1/0436/9652/1369/files/crazzy_frog_ringtone.pdf
    • https://cdn.shopify.com/s/files/1/0428/3056/1436/files/20861369757.pdf
    • https://cdn.shopify.com/s/files/1/0428/2833/3219/files/jirafeg.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6360/files/reducing_the_dimensionality_of_data_with_neural_networks.pdf
    • https://cdn.shopify.com/s/files/1/0428/4832/1692/files/moxegininuguzu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2733/2245/files/95590402513.pdf
    • https://cdn.shopify.com/s/files/1/0430/7478/1338/files/nekes.pdf
    • https://cdn.shopify.com/s/files/1/0433/5609/4614/files/sofobazarepojazawaninuke.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006982.bin
a444234f04cfc7b273730b37ce02f4c7d22b7b24fd2ec032ebef42c2face1b41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6982 5140 bytes
font_01_sfnt_off00007af0.bin
25c03cb7c1edb3bcbcff8b0c5f7a09e188dcf2eb508da5a41752d296c87ff605		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AF0 9904 bytes
font_02_sfnt_off00009cda.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CDA 4324 bytes

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