Malicious PDF — malware analysis report

Static analysis result for SHA-256 13d9edb420e2fc8e…

MALICIOUS

PDF

43.8 KB Created: 2020-09-01 00:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25af7cff31d47fe0c36400c00e6a1150 SHA-1: 419c447331233e456b7b79cab033a9293b68e64a SHA-256: 13d9edb420e2fc8e477321b96bd73eddd308e72b06d59e538c8185de3537fd05
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=avery+insertable+dividers+11200+template', which is flagged as malicious. The presence of a large number of external PDF links, many of which are on Shopify domains, suggests a link farm or SEO manipulation tactic to obscure the malicious redirector.

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=avery+insertable+dividers+11200+template
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/0898/1153/files/black_friday_full_movie_filmywap.pdf
    • https://cdn.shopify.com/s/files/1/0433/1733/0075/files/helping_linking_and_action_verbs.pdf
    • https://cdn.shopify.com/s/files/1/0431/4942/6845/files/17167386245.pdf
    • https://cdn.shopify.com/s/files/1/0439/5397/9550/files/freeview_tv_guide_bbc_scotland.pdf
    • https://cdn.shopify.com/s/files/1/0427/4782/2236/files/the_abc_s_of_calculus_volume_1.pdf
    • https://cdn.shopify.com/s/files/1/0432/5926/5188/files/55862189361.pdf
    • https://cdn.shopify.com/s/files/1/0431/4939/4080/files/temporary_internet_files_location_has_changed.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/vutisawodi.pdf
    • https://cdn.shopify.com/s/files/1/0449/7866/7688/files/juzebadizovezapazawam.pdf
    • https://cdn.shopify.com/s/files/1/0433/3672/8726/files/3179115928.pdf
    • https://static.usrfiles.com/ugd/b8c837_c87ef679b29142e49da0f635fd75b637.pdf
    • https://static.usrfiles.com/ugd/162fe6_e103db3e90b24528b2e15e3d7cad9853.pdf
    • https://static.usrfiles.com/ugd/b8c837_7450f0a71b8442cc90548803a306cbe0.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_off00006335.bin
1e12f78698a55fc50d0031e672c3b6bfa18ee17a90476f5cfadc60591520e9d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x6335 5720 bytes
font_01_sfnt_off000076aa.bin
78edb5417bfa6cf7b80f0044be65ad9d3e0d6cad487874d3e28bdf420179fea9
pdf-font-stream PDF embedded font (sfnt) at offset 0x76AA 13660 bytes