Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b5960600ef0998c…

MALICIOUS

PDF

43.1 KB Created: 2020-08-08 01:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8df1f6c511eabc06713a7a7ebf26d606 SHA-1: c1021bb6f0977a4804b07fd619ea2aca2d07d17f SHA-256: 0b5960600ef0998c1f3498c31af3f8513f846397628766c2a8521ad9aa30e94f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document body, though partially corrupted, contains text related to 'British English words list pdf' and the malicious URL, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=british+english+words+list+pdf
    • http://files.kippbiogeochemistry.com/uploads/1/3/0/7/130739470/05c972e955f3d1.pdf
    • http://files.thelostblonde.com/uploads/1/3/1/4/131453365/8689755.pdf
    • http://files.leesburgoptimistclubva.org/uploads/1/3/1/1/131164402/wakexiteg.pdf
    • http://files.amberbellemusic.us/uploads/1/3/1/3/131380482/lenarukevumep.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2125/4312/files/30680672870.pdf
    • https://cdn.shopify.com/s/files/1/0436/4809/0270/files/stihl_fs_90_r_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/5696/3479/files/10983038646.pdf
    • https://cdn.shopify.com/s/files/1/0431/9094/3904/files/responsible_driving_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3440/files/rugufexokuzufuzataresu.pdf
    • https://cdn.shopify.com/s/files/1/0448/4333/5837/files/mathematical_terms_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0431/7046/3895/files/75635536440.pdf
    • https://cdn.shopify.com/s/files/1/0434/9627/6128/files/nefijewadi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5113/0785/files/35212088752.pdf
    • https://cdn.shopify.com/s/files/1/0434/1222/6200/files/gigujogifonet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gadawatozuwagujezudoru.pdf
    • https://cdn.shopify.com/s/files/1/0430/4915/6757/files/16517866165.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000632c.bin
29a17bf7fa030c36646094a6caf6015842fa12d62d56ac32b33ee27813253f3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x632C 5232 bytes
font_01_sfnt_off0000750a.bin
79f02b66aa4dd8b3da0e0bb8a4d56e4880cf3c3413bf9f32969e5875dab746f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x750A 13416 bytes

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