Malicious PDF — malware analysis report

Static analysis result for SHA-256 676a998bebc51451…

MALICIOUS

PDF

39.8 KB Created: 2020-08-16 00:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c385a7d8fdcc02cd4af9a0cf1fa7bbff SHA-1: 306179f37519e178c495fda1966ed40cf2e36b85 SHA-256: 676a998bebc514519044438ab17268a9a7cde6b6bf2f94c9ba32792f10688c25
154 Risk Score

Malware Insights

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

The PDF document contains a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final destination of the malicious payload. The document body and embedded links suggest a lure to download further content, potentially a second-stage malware. The ML classifier strongly indicates maliciousness.

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=couper+pdf+en+deux+parties
    • http://files.oregoncabinetdesign.com/uploads/1/3/1/3/131383720/9532257.pdf
    • http://files.workinnvision.com/uploads/1/3/1/3/131384018/zudemesenodevakani.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/7195/3301/files/ruregajeretivewus.pdf
    • https://cdn.shopify.com/s/files/1/0433/0212/5733/files/wikigekojutap.pdf
    • https://cdn.shopify.com/s/files/1/0429/6356/6755/files/frases_completas_en_ingles.pdf
    • https://cdn.shopify.com/s/files/1/0434/2310/5189/files/16988255139.pdf
    • https://cdn.shopify.com/s/files/1/0432/2004/1886/files/wenedopigu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1797/7504/files/zetakifafezax.pdf
    • https://cdn.shopify.com/s/files/1/0432/3999/7595/files/blanche_neige_conte_court.pdf
    • https://cdn.shopify.com/s/files/1/0435/9376/0931/files/english_speaking_course_file_download.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_off00005a41.bin
60fca8c9eccc6bf462ac8a0516b1335734ab228e6188aa7843dd25daa55c6baa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A41 4976 bytes
font_01_sfnt_off00006b43.bin
92253d165341cca6b67e8f9be36cdda3676b68ce1d6e4f3694d1aa5faed2668b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B43 12080 bytes

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