Malicious PDF — malware analysis report

Static analysis result for SHA-256 765c35f8d0db253c…

MALICIOUS

PDF

43.8 KB Created: 2020-08-12 16:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe40d2a5b6b5c1e4bc8c4a67e93a8e3d SHA-1: 1c17a5355e548d3d35548a550081c8dc7d5ae7d2 SHA-256: 765c35f8d0db253ce139118825a83256ed3ce43e1d2d47a52a642e1de01505d9
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to host numerous PDF files. One of the primary links, 'https://ttraff.cc/pify?keyword=livro+administra%25C3%25A7%25C3%25A3o+da+produ%25C3%25A7%25C3%25A3o+e+opera%25C3%25A7%25C3%25B5es+correa+pdf', is identified as a malicious redirector. This suggests the document is part of a phishing or spam campaign aiming to direct users to potentially harmful 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=livro+administra%25C3%25A7%25C3%25A3o+da+produ%25C3%25A7%25C3%25A3o+e+opera%25C3%25A7%25C3%25B5es+correa+pdf
    • http://files.fortyukon.net/uploads/1/3/1/3/131379719/9029852.pdf
    • http://files.theetherealdream.com/uploads/1/3/0/7/130739081/8581009.pdf
    • http://files.iheartbookpublishing.com/uploads/1/3/1/3/131378921/7155802.pdf
    • http://files.orleansraks.com/uploads/1/3/2/6/132681665/koxofijol-didal.pdf
    • http://gabevev.foodandwinecyclingtours.com/uploads/1/3/1/6/131636725/wifatedururer.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2734/9159/files/welixoda.pdf
    • https://cdn.shopify.com/s/files/1/0428/6880/1702/files/wilesose.pdf
    • https://cdn.shopify.com/s/files/1/0434/7386/2808/files/lekekawumawezutumalufazi.pdf
    • https://cdn.shopify.com/s/files/1/0428/3134/7868/files/pexepe.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8863/files/22919731718.pdf
    • https://cdn.shopify.com/s/files/1/0428/5172/9567/files/titus_andronicus_sparknotes.pdf
    • https://cdn.shopify.com/s/files/1/0433/4170/9462/files/lectures_on_macroeconomics_blanchard_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/5674/2046/files/92206974945.pdf
    • https://cdn.shopify.com/s/files/1/0431/6479/5044/files/24803935243.pdf
    • https://cdn.shopify.com/s/files/1/0434/6734/1974/files/basic_electronics_ktu_notes.pdf
    • https://cdn.shopify.com/s/files/1/0430/5453/0709/files/98197066904.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_off0000635a.bin
c71219f2c0adba6cdc67838895292dc570ceec90ab0ccf207b320089dc859830		 pdf-font-stream PDF embedded font (sfnt) at offset 0x635A 5988 bytes
font_01_sfnt_off00007640.bin
49dffc78bbe274872d0df2f0b2522d37b2fde73b15a98a87d2a5be694cfade6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7640 13844 bytes

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