Malicious PDF — malware analysis report

Static analysis result for SHA-256 023eff508dfa2931…

MALICIOUS

PDF

40.7 KB Created: 2020-08-31 09:17:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cad9ae5b4d3a5526d455619687bc0ad3 SHA-1: 0bfa2e40509e87b69a6f9ba7b81c0158d6aada1c SHA-256: 023eff508dfa29313a500e8ffe5b06cc208fbef97ac10eaa968dff902c2d72ab
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a poster-making tool. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of multiple external links suggests a link farm or redirection strategy.

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=programa+para+fazer+cartazes+on-line
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/93c935_f1ad80a846fe4103a79761d32063ba7d.pdf
    • https://static.usrfiles.com/ugd/0dcf4b_9979eea4aa38443c84e34701e87f3ab4.pdf
    • https://static.usrfiles.com/ugd/30e015_64fd735e4e374a1d8c52ff01ffdc0612.pdf
    • https://static.usrfiles.com/ugd/b8c837_5cd4cb3a00ee47cca8d3479074a167e3.pdf
    • https://static.usrfiles.com/ugd/d5415a_0093dbf86dfb453fafb597b98b744d44.pdf
    • https://static.usrfiles.com/ugd/b8c837_d5275f14275f4be9b28eedb7b2fde6de.pdf
    • https://static.usrfiles.com/ugd/dd4472_e5c8c38592f64bc1b308b6d09b52b279.pdf
    • https://static.usrfiles.com/ugd/fe83c3_4fa8ebc44e144978a9ff2e239d0a6b3c.pdf
    • https://static.usrfiles.com/ugd/e2c250_89636b3cba874e43813790d3e77e31d4.pdf
    • https://static.usrfiles.com/ugd/409ca8_46d0b2bde085453da808ba36ddcc2040.pdf
    • https://static.usrfiles.com/ugd/a382ee_306a242be00d4f319cc174c935557493.pdf
    • https://static.usrfiles.com/ugd/a107db_5bd37f4aa9874278939cc4eabcf803da.pdf
    • https://static.usrfiles.com/ugd/badafb_80b2a9b7ae25478db05e16e2938b5545.pdf
    • https://static.usrfiles.com/ugd/b7306e_25177e10d08d477d86323d81e1bc4104.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_off00005dbe.bin
ce97ae71a72cab55aac60046d3cfa998974af90adc7116ed01fdff95bc6c2328		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DBE 5416 bytes
font_01_sfnt_off00007026.bin
28ebb017faf196f69113fe83fe84d40c0c67a8ac03959d718717646c1feaf28e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7026 11980 bytes

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