Malicious PDF — malware analysis report

Static analysis result for SHA-256 32c8b22a518f1fb9…

MALICIOUS

PDF

39.7 KB Created: 2020-08-22 09:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3a7b7e57300cfe7c1820c32c0605161 SHA-1: 1f85f7614f1232e5f9da680f11387f06a1acf3e3 SHA-256: 32c8b22a518f1fb9391aea5779aff7ca44d7f4fd6a8d16d4a900385e73611058
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one identified as a known malicious redirector. The document body, though partially corrupted, includes text related to 'Brennan b2 app for android' and references to wkhtmltopdf, suggesting a lure for users interested in this application. The presence of a PDF link farm heuristic further supports the attack pattern of redirecting users to potentially harmful sites.

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=brennan+b2+app+for+android
    • http://napas.flyajetsim.com/uploads/1/3/0/9/130969690/sagivi.pdf
    • http://files.unleashyourself.org/uploads/1/3/2/6/132695805/sizoxekubimak_kinijatusimoku_pafunaw_sinububafasa.pdf
    • https://cdn.shopify.com/s/files/1/0429/8774/9525/files/kimifevutajuzezapetik.pdf
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/escherichia_coli_scielo.pdf
    • https://cdn.shopify.com/s/files/1/0438/3706/3328/files/zisutorimumujokefiroreg.pdf
    • https://cdn.shopify.com/s/files/1/0429/5580/0739/files/82220846208.pdf
    • https://cdn.shopify.com/s/files/1/0432/8436/5476/files/joxikejex.pdf
    • https://cdn.shopify.com/s/files/1/0432/5031/9528/files/86879125647.pdf
    • https://cdn.shopify.com/s/files/1/0439/4346/1032/files/80522811571.pdf
    • https://cdn.shopify.com/s/files/1/0429/1769/1559/files/reginojava.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_off00005def.bin
d793e6dc0ad075aa6b4c39049481be3a749a6e20571481afa5263e58965b4ebb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DEF 5144 bytes
font_01_sfnt_off00006f7b.bin
3b1a1d59b7e9f0b10b3d96daf0bb25edc4e6735f98abe01b39b6ec68bf35adea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F7B 10220 bytes

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