Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a1a5d45d803f24b…

MALICIOUS

PDF

39.0 KB Created: 2020-08-26 06:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd2c5ee051da696d10cd14d3b55a037c SHA-1: e0624a189a3c6c4812374e8790444d0f1a86aa88 SHA-256: 7a1a5d45d803f24b2d7894947683d72619056e4bd2eef1efbaa16ed01d238df6
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure at 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to file conversion, suggesting a lure. The presence of many external PDF links, including benign ones, indicates a link farm strategy, likely to improve SEO for malicious content or to obscure the primary malicious URL. 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.ru/pify?keyword=convert+fp3+to+pdf
    • http://files.caddiskreekdesigns.com/uploads/1/3/2/7/132712358/1275597.pdf
    • http://fojoji.dsconway.com/uploads/1/3/1/4/131408100/kixajiwo.pdf
    • http://files.walkersvillehistoricalsociety.org/uploads/1/3/1/8/131871717/zugenuw_xapukijere_xegug_kebesaza.pdf
    • http://dugar.ohiodistrictaljc.com/uploads/1/3/0/7/130738568/9701304.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/2422114326.pdf
    • https://cdn.shopify.com/s/files/1/0432/3636/0351/files/tivazalubat.pdf
    • https://cdn.shopify.com/s/files/1/0430/8054/8503/files/redasegolajalisis.pdf
    • https://cdn.shopify.com/s/files/1/0433/1520/0158/files/55234559342.pdf
    • https://cdn.shopify.com/s/files/1/0435/0204/3288/files/edward_said_out_of_place.pdf
    • https://cdn.shopify.com/s/files/1/0433/2329/3864/files/remove_watermark_online_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/4230/8250/files/dichotomous_tree_identification_key_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/6304/9376/files/23008163742.pdf
    • https://cdn.shopify.com/s/files/1/0428/5821/7631/files/biztalk_server_2020_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/87687640701.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000503f.bin
52b5fe8a704420d9418b380ac9a28cde3706990dd628bcba5b720f7de1f93b52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x503F 4600 bytes
font_01_sfnt_off00005ff9.bin
329446eb1d9390d1b5c7c372676511d57bf6ff4c131588cdf1d66cb187f3c5db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF9 9776 bytes
font_02_sfnt_off00008175.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8175 4324 bytes

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