Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5e99a5c03480cae…

MALICIOUS

PDF

67.7 KB Created: 2020-08-12 18:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f5986a7be94d6516c99df0608e260f1 SHA-1: f429a5d6d6395876cebf9c8eec87fb4b1e744db1 SHA-256: b5e99a5c03480cae2d6af4ba7fd9d282a6887c283d90c10304b548f388459c3b
120 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to a link farm. One of the embedded links, 'https://ttraff.ru/pify?keyword=arduino+learning+sinhala+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, contains this same URL, suggesting it's the primary lure. The file's purpose appears to be directing users to malicious infrastructure.

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=arduino+learning+sinhala+pdf
    • http://rifigus.lhartcreations.com/uploads/1/3/0/8/130874655/9532651.pdf
    • http://files.manateeusa.com/uploads/1/3/1/4/131406826/zozikoru-siluvugot-zozutabifunaw-diredefud.pdf
    • http://files.crosslakekids.org/uploads/1/3/1/1/131163559/95286.pdf
    • http://files.stpeterstw.com/uploads/1/3/1/4/131453919/gumegujinigizog-biloxut.pdf
    • https://cdn.shopify.com/s/files/1/0431/8992/8096/files/ratio_and_root_test_for_convergence_of_series.pdf
    • https://cdn.shopify.com/s/files/1/0439/4660/6760/files/biblia_de_estudio_vida_plena_en.pdf
    • https://cdn.shopify.com/s/files/1/0439/5981/2254/files/ias_sociology_optional_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0437/6795/5610/files/catie_study_schizophrenia.pdf
    • https://cdn.shopify.com/s/files/1/0428/8629/9815/files/10832127671.pdf
    • https://cdn.shopify.com/s/files/1/0430/9411/4453/files/xekitap.pdf
    • https://cdn.shopify.com/s/files/1/0431/3061/8020/files/fulelobowosuvume.pdf
    • https://cdn.shopify.com/s/files/1/0441/0982/4152/files/xufuzobelekiluk.pdf
    • https://cdn.shopify.com/s/files/1/0434/0216/6428/files/que_significa_ser_asertivo.pdf
    • https://cdn.shopify.com/s/files/1/0427/9785/8972/files/58443031401.pdf
    • https://cdn.shopify.com/s/files/1/0437/6962/6781/files/bridge_bearing_design.pdf
    • https://cdn.shopify.com/s/files/1/0435/0607/3759/files/calvin_and_hobbes_collection.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_off0000cb94.bin
f31c2ed79e6658b1c059cad7a21d9c5b4460f1fe83722b23d058c7d33ee96876		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB94 5292 bytes
font_01_sfnt_off0000dd85.bin
d78ba8ba26eb7a7209a7c693267fabe734b49812bc8e7d66cb83d5878efc6208		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD85 10560 bytes

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