Malicious PDF — malware analysis report

Static analysis result for SHA-256 1807a00430ee7563…

MALICIOUS

PDF

40.1 KB Created: 2020-08-25 04:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 961c0c4954e1c5f7d99d4787fae64c8e SHA-1: fc10a241888a350b98a48fe763c877b4221d0fe3 SHA-256: 1807a00430ee75637f64858cac7532d107b6a2e0c5f98fb24d892d53640a8b19
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many of which are benign Shopify links but one points to potentially malicious infrastructure. The presence of a visual download button lure further supports a malicious intent to trick the user into clicking the link. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=allen+major+test+papers++2017+pdf
    • http://bozamab.bildwerkfrauenau.de/uploads/1/3/1/4/131453870/viwekogasoke-vizesud-gupekarivifuz-mavajujokasof.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/0149/4179/files/26421483976.pdf
    • https://cdn.shopify.com/s/files/1/0441/1890/0888/files/vuravikumoxaresevajamut.pdf
    • https://cdn.shopify.com/s/files/1/0433/5301/4427/files/asepsia_y_antisepsia_medica.pdf
    • https://cdn.shopify.com/s/files/1/0436/5543/0302/files/dagotixufavakimo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7357/6865/files/stylesheet_in_html_xsl.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/taridulozomoxekolakinuku.pdf
    • https://cdn.shopify.com/s/files/1/0433/1651/0873/files/90596546794.pdf
    • https://cdn.shopify.com/s/files/1/0461/4707/6259/files/ardenne_high_school_sixth_form_students.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/15946461326.pdf
    • https://cdn.shopify.com/s/files/1/0435/4536/2591/files/56531510690.pdf
    • https://cdn.shopify.com/s/files/1/0431/3756/4823/files/66965285843.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_off00005b85.bin
136cb5cc050457ff44ee17fefb6c12694e472fa708e39e29f52853f59b459d05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B85 5656 bytes
font_01_sfnt_off00006ebd.bin
32869f10eba885ff91a75f1011819f10a9fdecf173eb807c5b378ccddb8282fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EBD 10752 bytes

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