Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f61de72d17b61a…

MALICIOUS

PDF

41.0 KB Created: 2020-08-30 12:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bac48c328958e9bb22930bd6f97e5a1c SHA-1: 1621aa1a60978d4cb32c16ddc924fef926243e92 SHA-256: 43f61de72d17b61aee0b10a6bd0914ebfcae120b9b343c46c4f2e72f55932c58
150 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with one pointing to a known malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM indicate a deliberate attempt to host and link to external content. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/wix?keyword=manuales+cto+mir, suggesting a lure related to 'manuales cto mir'. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be directing users to malicious infrastructure via embedded links.

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/wix?keyword=manuales+cto+mir
    • https://cdn.shopify.com/s/files/1/0435/3032/2084/files/90497843255.pdf
    • https://cdn.shopify.com/s/files/1/0435/1839/4523/files/steam_download_speed.pdf
    • https://cdn.shopify.com/s/files/1/0433/7097/1299/files/52476439484.pdf
    • https://cdn.shopify.com/s/files/1/0447/9772/2785/files/tilewopebo.pdf
    • https://cdn.shopify.com/s/files/1/0465/3845/7238/files/the_csi_project_delivery_practice_gu.pdf
    • https://static.usrfiles.com/ugd/a771bd_951b5fa69dc6486299de0d8b0c69e26d.pdf
    • https://static.usrfiles.com/ugd/0ebc1f_795c87a97eca474b97938c7d7f2115df.pdf
    • https://static.usrfiles.com/ugd/704566_7abb869921a84ef787963104ff2a86e8.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_79e73b47e35c40818182f0849cca6aae.pdf
    • https://static.usrfiles.com/ugd/9c0842_0be10e66abb943b296c9a1af390dc42e.pdf
    • https://cdn.shopify.com/s/files/1/0428/2171/4076/files/4872417363.pdf
    • https://cdn.shopify.com/s/files/1/0432/3721/2319/files/71209816336.pdf
    • https://cdn.shopify.com/s/files/1/0427/9848/1564/files/pusamatepapajumidejerotot.pdf
    • https://cdn.shopify.com/s/files/1/0434/9424/4516/files/53721393060.pdf
    • https://cdn.shopify.com/s/files/1/0447/3608/6172/files/mapa_turistico_alemania.pdf
    • https://cdn.shopify.com/s/files/1/0434/9244/2264/files/wotasur.pdf
    • https://cdn.shopify.com/s/files/1/0434/5013/8784/files/dungeoneering_potions_guide.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_off00005fde.bin
b60c1da0a40e1afa1f9a71476c31416e1321258aa37db6f06156a4bab69cd1d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FDE 4952 bytes
font_01_sfnt_off00007099.bin
e9a2ee0d1c47990502cb8b8a97b5063624c02a52156da3c5025c72a19dfd6e8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7099 11496 bytes