Malicious PDF — malware analysis report

Static analysis result for SHA-256 756e53701831a8d7…

MALICIOUS

PDF

42.3 KB Created: 2020-08-26 09:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c367baf49eb1fdf4e7e5199578fb2655 SHA-1: 26aa5fd661626c8984995b50ae858d577dffaa67 SHA-256: 756e53701831a8d7aa95e583e708daebc1caa233ddc221188f27f44c07d68a81
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically `https://ttraff.club/pify?keyword=kubota+l3400+service+manual`. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to various PDF files, many hosted on Shopify. The document body, though heavily obfuscated, contains references to the service manual lure and the malicious URL, suggesting an attempt to disguise malicious activity as legitimate content. 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.club/pify?keyword=kubota+l3400+service+manual
    • http://files.rautoulab.com/uploads/1/3/1/8/131856435/jomefuzu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/6776/0028/files/converter_para_word_candy.pdf
    • https://cdn.shopify.com/s/files/1/0430/0655/8359/files/ziteli.pdf
    • https://cdn.shopify.com/s/files/1/0436/3183/7344/files/51803922826.pdf
    • https://cdn.shopify.com/s/files/1/0431/6617/1285/files/14404334519.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8865/files/zuwutimuruwezegaxibama.pdf
    • https://cdn.shopify.com/s/files/1/0427/5381/8790/files/gaming_mouse_cursors_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/0004/5465/files/not_about_angels_birdy_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0434/6835/7796/files/38025824204.pdf
    • https://cdn.shopify.com/s/files/1/0435/3681/0135/files/54118889665.pdf
    • https://cdn.shopify.com/s/files/1/0431/5794/6519/files/59120092080.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_off0000574d.bin
1353610ec88c7b263533b49c28d23ca527ed5337cffab64685c6db1f9f6a87e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x574D 5392 bytes
font_01_sfnt_off0000698d.bin
15f97761d74dec2ad93fb59afb4c8a4c98bfa98c28d110cdc18daa725d00d41f
pdf-font-stream PDF embedded font (sfnt) at offset 0x698D 10824 bytes
font_02_sfnt_off00008e91.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E91 4324 bytes