Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ef11a9eee90ae2b…

MALICIOUS

PDF

54.5 KB Created: 2020-08-25 05:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1df343ff26034030d50650312befb96e SHA-1: 0a40a70fdec403540c35b3515cb228ff4d0e8058 SHA-256: 6ef11a9eee90ae2b07e8eb5f62d837cfef8fc570a8b1342716e38e609019a97c
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that is also flagged as a redirector. The ML classifier also strongly indicated maliciousness. The presence of numerous external PDF links suggests an attempt to create a link farm or distribute further malicious content.

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.cc/pify?keyword=analytical+ability+test+pdf
    • http://vegulusix.ameliasherry.com/uploads/1/3/1/3/131379730/kejelebizogela.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1661/8145/files/zeguxabumuber.pdf
    • https://cdn.shopify.com/s/files/1/0437/9131/9201/files/jigejedefonovapatazawijov.pdf
    • https://cdn.shopify.com/s/files/1/0432/6300/0734/files/81145297233.pdf
    • https://cdn.shopify.com/s/files/1/0436/2207/2480/files/35156390449.pdf
    • https://cdn.shopify.com/s/files/1/0433/6166/5192/files/xemevekum.pdf
    • https://cdn.shopify.com/s/files/1/0434/3696/6055/files/65943746194.pdf
    • https://cdn.shopify.com/s/files/1/0447/8740/0864/files/microsoft_word_mailing_label_template.pdf
    • https://cdn.shopify.com/s/files/1/0464/7560/8214/files/stalker_shadow_of_chernobyl_highly_compressed.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_off000097f8.bin
bc8f3d7e54f3e22021ba8418f51fb0ea726abdcc3d81461014cf1dc91c2759a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97F8 5284 bytes
font_01_sfnt_off0000aa00.bin
9b773f82b4a37fdcd7198b30cfd8afccbfd36939d69783af9393e477a86a15d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA00 10376 bytes

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