Malicious PDF — malware analysis report

Static analysis result for SHA-256 65f490c91fbb40e5…

MALICIOUS

PDF

46.9 KB Created: 2020-08-22 06:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ffb06a31027beba62e8fd04786b0e1f7 SHA-1: 2e31938238dbf1a73974796f1d75f05db9f3f17f SHA-256: 65f490c91fbb40e5add65673ecd903398d9773418d6d79bdc611947c2312e204
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. It also exhibits characteristics of a PDF link farm, with numerous external links, as flagged by PDF_SEO_LINK_FARM. The ML classifier strongly indicated maliciousness. The embedded URL points to a redirector designed to lure users to potentially harmful content.

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.com/pify?keyword=finite+and+infinite+sequence+worksheet
    • http://files.domainspareparts.com/uploads/1/3/1/4/131454373/fadakomezozofaro.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0448/3537/3213/files/aosp_extended_launcher_apk.pdf
    • https://cdn.shopify.com/s/files/1/0432/3193/6674/files/pukaxuvo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9812/0094/files/bozozizexezo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6048/5541/files/34315234492.pdf
    • https://cdn.shopify.com/s/files/1/0435/4798/4027/files/an_introduction_to_cardiovascular_physiology_levick.pdf
    • https://cdn.shopify.com/s/files/1/0429/1565/9942/files/403_forbidden_nginx.pdf
    • https://cdn.shopify.com/s/files/1/0427/7387/2807/files/77379415585.pdf
    • https://cdn.shopify.com/s/files/1/0431/4395/4594/files/importance_of_agriculture_sector_in_pakistan.pdf
    • https://cdn.shopify.com/s/files/1/0431/5719/2853/files/ribujomisenenopevozufabor.pdf
    • https://cdn.shopify.com/s/files/1/0439/7996/4574/files/34735101030.pdf
    • https://cdn.shopify.com/s/files/1/0429/0409/2828/files/junapuziwozis.pdf
    • https://cdn.shopify.com/s/files/1/0437/3191/0810/files/3773820884.pdf
    • https://cdn.shopify.com/s/files/1/0463/6829/3019/files/boxing_star_uptodown.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005db4.bin
76539bd36e216fb5d542444d6aed8f9281b5792996e4520937d5ae1289300c89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DB4 5316 bytes
font_01_sfnt_off00006fd1.bin
aaecf1c0b5eb079978a0a7c068d91fa78e716f9865094e3df224b1bf72af30aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FD1 12624 bytes
font_02_sfnt_off0000987f.bin
f22d8fd9533caa61c6a2d307bb69cf86343a2ada2e779b71f3de02dd673fb1b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x987F 16356 bytes

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