Malicious PDF — malware analysis report

Static analysis result for SHA-256 502a09d278e90fcf…

MALICIOUS

PDF

39.7 KB Created: 2020-08-06 19:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e2dfb53cf72e686b75d6837d7a24c41 SHA-1: 6b20a40081673916d37ae8ab57de094bb811ea1e SHA-256: 502a09d278e90fcf8a009e38482bf2a420122f60fcd12fed02bcbfc7b3a1446d
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a manual, aiming to lure users to a malicious site. The PDF also contains a large number of external links, many of which point to similarly structured URLs on Shopify, suggesting a link farm for SEO poisoning. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of the malicious redirector is sufficient evidence of malicious intent.

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=rational+combi+oven+parts+manual+pdf
    • http://files.nathanbirr.com/uploads/1/3/2/7/132740378/76a563d8d5d46.pdf
    • http://files.northbuffalopresbyterian.com/uploads/1/3/0/9/130968988/9673468.pdf
    • http://files.anticsofsusieq.net/uploads/1/3/0/8/130814052/gevosiririf.pdf
    • http://files.serenitythroughsound.com/uploads/1/3/1/6/131636845/nirawa_relasokoxelusu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2779/9969/files/ati_comprehensive_predictor_2015.pdf
    • https://cdn.shopify.com/s/files/1/0431/3061/8011/files/tifipimemagodapavemiv.pdf
    • https://cdn.shopify.com/s/files/1/0431/9074/7295/files/viwedexujuxenitaburul.pdf
    • https://cdn.shopify.com/s/files/1/0431/3835/1255/files/adrenal_insufficiency_pediatrics.pdf
    • https://cdn.shopify.com/s/files/1/0429/1136/7331/files/34198458795.pdf
    • https://cdn.shopify.com/s/files/1/0431/2327/7973/files/63236280930.pdf
    • https://cdn.shopify.com/s/files/1/0428/2066/5510/files/jipuzezote.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/farelilulof.pdf
    • https://cdn.shopify.com/s/files/1/0448/4333/5837/files/speaking_sub_skills.pdf
    • https://cdn.shopify.com/s/files/1/0436/0683/5358/files/sebaluwamavewewitogoju.pdf
    • https://cdn.shopify.com/s/files/1/0429/9633/4753/files/72218796376.pdf
    • https://cdn.shopify.com/s/files/1/0440/3986/4485/files/83250765609.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_off00005b53.bin
265d7c2b83b7e44241bd3398d1fc6e680c2f875f3e906e6daf75c018d10fd25f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B53 5508 bytes
font_01_sfnt_off00006dfd.bin
a2f635ac08a5370dad2a501b195c29427097d30d1905160e30613c5beef09638		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DFD 10536 bytes

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