Malicious PDF — malware analysis report

Static analysis result for SHA-256 112f0eca23d5ed47…

MALICIOUS

PDF

50.4 KB Created: 2020-08-10 07:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ceb721d9909615ab8224086000271a78 SHA-1: 02507143fb08b530f015bc9ff3cbcf5c554b7f31 SHA-256: 112f0eca23d5ed4792655202a0d70598d231816d03f805324763397e2abe1bfb
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.ru/pify?keyword=pesquisa+bibliogr%25C3%25A1fica+livro+pdf. The document body also contains numerous links to various PDF files hosted on external domains, suggesting a link farm or a method to obscure the true malicious destination. The ML classifier also 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=pesquisa+bibliogr%25C3%25A1fica+livro+pdf
    • http://files.grandsalinelibrary.com/uploads/1/3/1/3/131384101/476b34764b88534.pdf
    • http://files.whatcomexcavator.org/uploads/1/3/0/7/130775286/mavatokizidaxo.pdf
    • http://files.dallas4hshotgunsports.org/uploads/1/3/1/4/131438330/9445590.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/8470/7992/files/bold_moves_for_schools.pdf
    • https://cdn.shopify.com/s/files/1/0431/1485/6610/files/61775327192.pdf
    • https://cdn.shopify.com/s/files/1/0433/6818/6015/files/zekakugorotekemuda.pdf
    • https://cdn.shopify.com/s/files/1/0428/7509/3159/files/22387931906.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/9148047639.pdf
    • https://cdn.shopify.com/s/files/1/0438/0000/2717/files/61945379669.pdf
    • https://cdn.shopify.com/s/files/1/0433/3400/8987/files/stephanie_williams_stone_cold_steve_austin.pdf
    • https://cdn.shopify.com/s/files/1/0434/5122/0134/files/43328164854.pdf
    • https://cdn.shopify.com/s/files/1/0441/2165/3400/files/90702299349.pdf
    • https://cdn.shopify.com/s/files/1/0431/2681/6932/files/72980498327.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kikurum.pdf
    • https://cdn.shopify.com/s/files/1/0430/8199/0304/files/83477228128.pdf
    • https://cdn.shopify.com/s/files/1/0435/4870/4920/files/kitiputosamaxegas.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_off0000768b.bin
3ac25ec06f465eac60674572dd91b5f56663019a022e259be643200dcfc73011		 pdf-font-stream PDF embedded font (sfnt) at offset 0x768B 5884 bytes
font_01_sfnt_off00008a0c.bin
e2f5d3ef3d159c4618a897938a4514967e3e9e15e90b00f9078329914e8d563d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A0C 1812 bytes
font_02_sfnt_off000092e9.bin
bcd63a218d28764e9549c7cc1eb08d8f97e9214024b2ca8ca46c40690f3f2799		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92E9 12948 bytes

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