Malicious PDF — malware analysis report

Static analysis result for SHA-256 101f65640ee51981…

MALICIOUS

PDF

52.4 KB Created: 2020-08-10 07:36:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: feb5d3e8aaf1fb5d32403652ea49e0b7 SHA-1: d9b7bce2be4325709b22b5973c0b60ebcede8d82 SHA-256: 101f65640ee51981d2a401c5a59bd2c40e7862dcad4d7b7ba2163f696ece22bc
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with the primary one leading to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the embedded URLs and the nature of the link farm point towards a phishing or content-distribution scheme.

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=definicion+de+diagnostico+educativo+pdf
    • http://files.thecreativeday.com/uploads/1/3/1/6/131607467/457522e34c918.pdf
    • http://dixezor.courtneysuzannelee.com/uploads/1/3/2/7/132740214/1699983.pdf
    • http://files.artofsales.us/uploads/1/3/0/7/130776046/9e165b5a04.pdf
    • http://lutitu.chickenskauai.com/uploads/1/3/0/7/130776131/gapoku.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9309/8660/files/katijudiwidim.pdf
    • https://cdn.shopify.com/s/files/1/0432/5962/5627/files/76703658834.pdf
    • https://cdn.shopify.com/s/files/1/0428/4514/3207/files/23498817061.pdf
    • https://cdn.shopify.com/s/files/1/0431/6066/6274/files/schneider_rccb_catalogue_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/9915/1768/files/jonig.pdf
    • https://cdn.shopify.com/s/files/1/0429/6966/1589/files/27046078994.pdf
    • https://cdn.shopify.com/s/files/1/0429/6504/1311/files/city_domain_5e.pdf
    • https://cdn.shopify.com/s/files/1/0437/9007/4016/files/ordinal_numbers_and_months_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pekuxiwitijumowiviw.pdf
    • https://cdn.shopify.com/s/files/1/0431/2177/0657/files/nokipob.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_off00008ca6.bin
de9f9b02736f72e728f7c64486aec027db0e814a81b0e06b9f4197d3479d7429
pdf-font-stream PDF embedded font (sfnt) at offset 0x8CA6 5256 bytes
font_01_sfnt_off00009eb6.bin
db6ef1f133c8a4ffe7ecd9491c5b83d5207a01aeb675ed6f36b16cb6af8e01cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x9EB6 11448 bytes