Malicious PDF — malware analysis report

Static analysis result for SHA-256 adef97fa82e3214d…

MALICIOUS

PDF

48.2 KB Created: 2020-08-30 01:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f40769a725d2b3922996df0d4dcfab35 SHA-1: 24fead336f72a74135983d552c5b1a96d7f0825d SHA-256: adef97fa82e3214d7b3356cb2e971d0fe85aab4bd16301995e337fc58b478990
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.link/wix?keyword=poemas+con+figuras+retoricas+se%25C3%25B1alad', is likely intended to lead the user to a malicious site. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify. The ML classifier strongly indicates maliciousness. No scripts were extracted, but the presence of the malicious redirector is sufficient evidence of a phishing or malware delivery attempt.

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.link/wix?keyword=poemas+con+figuras+retoricas+se%25C3%25B1alad
    • https://cdn.shopify.com/s/files/1/0431/0558/3266/files/adobe_illustrator_blank_templates_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/5009/8078/files/japokilefarejoworux.pdf
    • https://cdn.shopify.com/s/files/1/0433/4003/8302/files/28246711686.pdf
    • https://cdn.shopify.com/s/files/1/0434/1340/5850/files/xiluluzipariseladaf.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3821/files/flat_booking_format.pdf
    • https://cdn.shopify.com/s/files/1/0455/6845/8917/files/assyrian_alphabet.pdf
    • https://cdn.shopify.com/s/files/1/0432/1283/2932/files/bluecoat_academy_nottingham_ofsted_report.pdf
    • https://cdn.shopify.com/s/files/1/0440/7758/0453/files/29060373362.pdf
    • https://cdn.shopify.com/s/files/1/0434/0819/5751/files/escala_cromatica_teclado.pdf
    • https://static.usrfiles.com/ugd/b8c837_17b5cb38d3bf4ada83ceb24de350cd4a.pdf
    • https://static.usrfiles.com/ugd/b8c837_fe9d8082320a4ceab11390cfd2e64385.pdf
    • https://static.usrfiles.com/ugd/b8c837_ab1c81ca3e394f149433789237b1c16c.pdf
    • https://static.usrfiles.com/ugd/b8c837_ab5a2ddd97b54485a6a6a44b8f02f9f1.pdf
    • https://static.usrfiles.com/ugd/b8c837_62a7d0c0d7874b74b6a20286b1112f3b.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_7b6b57c08b604f3bbe18aa12929372a5.pdf
    • https://static.usrfiles.com/ugd/5b9a87_a43e07bad8af482587099aedd388e8a1.pdf
    • https://static.usrfiles.com/ugd/b8c837_cd4141fcf85948148f7b269342f39ab0.pdf
    • https://static.usrfiles.com/ugd/b8c837_f9af7a790e93473fa6d4c3bc2c228543.pdf
    • https://static.usrfiles.com/ugd/87a178_ffd13bbec7274e0782ff11c8f6d41546.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bf1.bin
484af4e5b009e7a04a17ce74643f1c75eaf31d71dda19fa32eb45b7260f6962f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF1 5436 bytes
font_01_sfnt_off00007e09.bin
dcb3dd331c34e7e26a1987e3a483effed3a40b5f3c2218a6f7098196025b10d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E09 11576 bytes
font_02_sfnt_off0000a345.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA345 4324 bytes

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