Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f3a8c1058546bff…

MALICIOUS

PDF

37.9 KB Created: 2020-08-01 13:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfec76ef9cdf29e2f9ed76e93ced434e SHA-1: 440c6d9a12b9d2f485934c1f9943aab6a18d90d6 SHA-256: 0f3a8c1058546bff80c15d2492682415586189301da4f07f5af163c8649bac75
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely intended to lead the user to a malicious site. The document body, though heavily obfuscated, contains the string 'Cub cadet 1050' and the malicious URL, suggesting a lure. The presence of numerous external PDF links, many hosted on Shopify, further indicates a link farm or redirection strategy. The ML classifier strongly flagged this PDF as malicious.

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=cub+cadet+1050
    • http://files.uciesl.com/uploads/1/3/2/6/132682124/kikujumi-kupejodog-nunisetujujiga-gutono.pdf
    • http://files.atlasbible.org/uploads/1/3/1/4/131406826/rutagatamokuk_gewiwesegeledox_kuvar_golemikufebo.pdf
    • http://files.floydcomputing.com/uploads/1/3/2/7/132710628/lavim-wenife-wafutanelobop.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/1905/7822/files/86561337305.pdf
    • https://cdn.shopify.com/s/files/1/0430/6118/2617/files/gitignore_for_unity.pdf
    • https://cdn.shopify.com/s/files/1/0430/1278/4277/files/60713697790.pdf
    • https://cdn.shopify.com/s/files/1/0432/5575/9011/files/83419837189.pdf
    • https://cdn.shopify.com/s/files/1/0429/9964/4314/files/health_calculator_5e.pdf
    • https://cdn.shopify.com/s/files/1/0433/0684/4315/files/xavafuke.pdf
    • https://cdn.shopify.com/s/files/1/0435/9897/1038/files/bubudoram.pdf
    • https://cdn.shopify.com/s/files/1/0430/4646/9793/files/baxavuvepasolavizekufar.pdf
    • https://cdn.shopify.com/s/files/1/0432/5471/0427/files/wesedufa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ranugebiwuzejivuzuf.pdf
    • https://cdn.shopify.com/s/files/1/0435/0522/1784/files/xesupux.pdf
    • https://cdn.shopify.com/s/files/1/0429/2503/1587/files/62218409043.pdf
    • https://cdn.shopify.com/s/files/1/0434/2611/9847/files/wefinaxoruputomize.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_off000053e1.bin
9ad008e6017bae435aa501563775f4a999e58a103e820feb370e1946141e5c1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53E1 4992 bytes
font_01_sfnt_off000064ee.bin
2a4ff190837c98c32f885f388aa6bbae9d47c947db5ab716167817e63b45c182		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64EE 11104 bytes

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