Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef123e772567ddd…

MALICIOUS

PDF

46.8 KB Created: 2020-07-26 15:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76c5d99fcc9c8e311b7f338f4c5d3cd7 SHA-1: a2bcc9918612551535794a88910994a9b5b7e2fa SHA-256: 5ef123e772567ddd9b82da2923ff1c1c470c78837ca535f82e49c706af8a8eda
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing indicating it links to malicious redirector infrastructure, specifically a URL related to 'cricket score sheet editable'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of numerous external links, many hosted on Shopify, suggests a link farm or redirection scheme designed to lead users to malicious 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=cricket+score+sheet+editable
    • http://files.english3000.org/uploads/1/3/1/6/131637374/bewajasasabozej_kiwuwukaduwelev_neruti_sazeve.pdf
    • http://files.calgarypianoexpressions.ca/uploads/1/3/0/7/130775398/1401387.pdf
    • http://files.trsor.com/uploads/1/3/1/4/131437246/vuzezom_lekewikuj_xabokezijasejiv.pdf
    • http://files.pgridirectory.com/uploads/1/3/0/7/130738852/718c1.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/1208/8231/files/venejoriwosinodada.pdf
    • https://cdn.shopify.com/s/files/1/0433/9567/8357/files/gegiso.pdf
    • https://cdn.shopify.com/s/files/1/0428/0975/3767/files/riduxugisovukinazuzim.pdf
    • https://cdn.shopify.com/s/files/1/0431/6073/1803/files/wewugazodimisebiroxu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3486/9921/files/zadekevetufogepaxuduvag.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bipifapokuwegi.pdf
    • https://cdn.shopify.com/s/files/1/0437/5920/6561/files/36295633377.pdf
    • https://cdn.shopify.com/s/files/1/0431/8360/3876/files/jojeruvagoxexifurudode.pdf
    • https://cdn.shopify.com/s/files/1/0429/7293/8399/files/wifesud.pdf
    • https://cdn.shopify.com/s/files/1/0430/4610/9345/files/defurenovotesibulinezu.pdf
    • https://cdn.shopify.com/s/files/1/0435/7410/0127/files/vutasira.pdf
    • https://cdn.shopify.com/s/files/1/0428/9301/7247/files/32069534527.pdf
    • https://cdn.shopify.com/s/files/1/0438/2107/2541/files/maxipuvop.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_off0000717a.bin
ee81cab254ac85aeb2a8d6fe0e230f9e5d951218a9efd47771ff3bdca439f7a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x717A 1604 bytes
font_01_sfnt_off000079a1.bin
8bcf61b7a81e29255bb2e9656c5fea4077c96b509016db91e3220c16c7f0c8e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79A1 4936 bytes
font_02_sfnt_off00008a72.bin
97bd1799e9cc7494caeedc415522636b0515ad735bfc4d125eebd1a92d118429		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A72 10336 bytes

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