Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d3e78b66da34600…

MALICIOUS

PDF

35.2 KB Created: 2020-08-31 18:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9cfd1dca1b868b322975df44738e5c4e SHA-1: 0c54ed5c981a72f1acf9361367d3702c723bd337 SHA-256: 6d3e78b66da34600575d27c4e6d2cb6d95c0261d317d53f21438b36b9df58a0a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, with one specifically identified as a malicious redirector. The document body, though obfuscated, contains the URL 'https://ttraff.com/wix?keyword=combining+sentences+with+transition+words+worksheet', suggesting a lure to a malicious site. The presence of multiple PDF links and the ML classifier's high confidence indicate malicious intent, likely for phishing or malware distribution.

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/wix?keyword=combining+sentences+with+transition+words+worksheet
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0825/3344/files/70389932854.pdf
    • https://cdn.shopify.com/s/files/1/0430/6511/4775/files/81308673914.pdf
    • https://cdn.shopify.com/s/files/1/0439/5037/5070/files/71061543465.pdf
    • https://cdn.shopify.com/s/files/1/0440/9029/4437/files/83018535131.pdf
    • https://static.usrfiles.com/ugd/b8c837_109c11e779594eff83c1b5f4ee0ce557.pdf
    • https://static.usrfiles.com/ugd/8cbfce_a9cc65bf265247cbb7543a5693e44937.pdf
    • https://cdn.shopify.com/s/files/1/0431/5021/3274/files/miwosagib.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/balevogigadan.pdf
    • https://static.usrfiles.com/ugd/c7a620_260147a3360f48aa9ebea368765ace47.pdf
    • https://static.usrfiles.com/ugd/4b874d_e38d0451f7d84f8a8eeabca46b423a0a.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_9927f998070f491b97715692218c3af2.pdf
    • https://static.usrfiles.com/ugd/850f07_7ac67fd62da04b098c4b6338fb4096bb.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_off00004b4e.bin
e917788f2221101e258a9c54b537c78cf9af197dfc836ac7c69973fdda10b87e
pdf-font-stream PDF embedded font (sfnt) at offset 0x4B4E 5524 bytes
font_01_sfnt_off00005df9.bin
f2d6d15a63dda3f925f30e97265f398d64594002b0b153a9961c64f68afca410
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DF9 9920 bytes