Malicious PDF — malware analysis report

Static analysis result for SHA-256 09959bd162367367…

MALICIOUS

PDF

38.0 KB Created: 2020-08-24 12:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a7e1fddbd4e054367184b8f81ff824b SHA-1: d4e455b022987cab36b0a4f95a9fdaed67fd33cd SHA-256: 09959bd162367367333a5f77cb9814f04f791aeebd4c04124341e323f9cd997e
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 pointing to 'ttraff.ru'. The document body also contains this URL along with a list of other URLs, suggesting a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is used for malicious redirection.

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=official+ebay+android+app+apk
    • http://files.everystepsavictory.com/uploads/1/3/1/4/131407796/7b53d320a6d.pdf
    • http://vinevod.ptcwyoming.com/uploads/1/3/1/3/131383483/8440383.pdf
    • http://luvubov.bartslondondentalsociety.com/uploads/1/3/2/6/132681670/0001798c0f7e1.pdf
    • http://files.ebisuonline.com/uploads/1/3/1/0/131070291/546750.pdf
    • http://fatuzane.heightsfloraldesigns.com/uploads/1/3/1/4/131437736/3497831.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9603/9839/files/way_back_into_love_piano_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/6671/9385/files/bash_read_file_line_by_line.pdf
    • https://cdn.shopify.com/s/files/1/0435/6535/1075/files/back_end_developer_handbook_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/0485/4426/files/zumivubilagagujewisikawi.pdf
    • https://cdn.shopify.com/s/files/1/0429/0212/6751/files/prentice_hall_chemistry_answer_keys.pdf
    • https://cdn.shopify.com/s/files/1/0429/5314/6517/files/kawefaberenebonub.pdf
    • https://cdn.shopify.com/s/files/1/0431/6053/5196/files/77786193913.pdf
    • https://cdn.shopify.com/s/files/1/0428/8777/4374/files/enterprise_risk_management_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/7300/2902/files/junugunadi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0158/5570/files/bebej.pdf
    • https://cdn.shopify.com/s/files/1/0433/8122/7672/files/jokonepunojuwuwalide.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_off000058ea.bin
be0b169a85a19997e07911fe3b67706f73b2b6af1dc32d0e98249e660d5b3dbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58EA 5304 bytes
font_01_sfnt_off00006aff.bin
ab288c3d187c6dd7242fff1442402720699702ffe231f85ce52f2d692929eb39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AFF 9380 bytes

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