Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b289b8eb5209d8…

MALICIOUS

PDF

44.4 KB Created: 2020-07-31 05:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6293b0b9bdedc5f04f800b08d9c37ca5 SHA-1: 37bdb8243e55d432a50e800242490aeaa9448e02 SHA-256: c4b289b8eb5209d8ee52888351b83881b7952399abca5015f3b44836a4af293c
120 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with one identified as a malicious redirector. The document body is heavily obfuscated, but the presence of numerous external links, including a link to a redirector, strongly suggests a phishing or malicious redirection attempt. The file was generated using wkhtmltopdf, which can be abused to create malicious PDFs.

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=complete+sentences+exercises+pdf
    • http://files.charmingandchair-ished.com/uploads/1/3/1/8/131856703/8811040.pdf
    • http://files.puzzlepiecesmass.com/uploads/1/3/1/8/131858916/laxegifodem.pdf
    • http://files.nextstepsdaycare.net/uploads/1/3/0/9/130969254/poguriragejarav-fuvoxusibalaros-jixapigob-saketon.pdf
    • http://files.learningspiritenergy.com/uploads/1/3/2/3/132303024/kajademimapotagof.pdf
    • https://cdn.shopify.com/s/files/1/0428/5821/7631/files/76754606599.pdf
    • https://cdn.shopify.com/s/files/1/0431/3009/3728/files/53399958915.pdf
    • https://cdn.shopify.com/s/files/1/0431/2026/3322/files/zifugadat.pdf
    • https://cdn.shopify.com/s/files/1/0427/8448/9631/files/55464709032.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30812088679.pdf
    • https://cdn.shopify.com/s/files/1/0430/4168/5665/files/vonuzotanawijagub.pdf
    • https://cdn.shopify.com/s/files/1/0431/7655/8746/files/74027415159.pdf
    • https://cdn.shopify.com/s/files/1/0428/1712/6567/files/nivudoboxepodikulakapusi.pdf
    • https://cdn.shopify.com/s/files/1/0429/4891/9450/files/jamajon.pdf
    • https://cdn.shopify.com/s/files/1/0431/2226/2178/files/lonibekovedavejofew.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/
    • https://cdn.shopify.com/s/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007000.bin
fbb573f0100491f35b3650df4802a7705c2fe34398a4acba070101d1f7a20057		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7000 4968 bytes
font_01_sfnt_off000080d3.bin
4906a4fa66927a859628981335c94ad138f93ef3cffa6dcd8fa6244a7baf1faf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80D3 10484 bytes

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