Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a7937adee945ec…

MALICIOUS

PDF

63.9 KB Created: 2020-08-25 06:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce11b3318d13d93b2c2c72bf1fb6e831 SHA-1: 972abf1a28390947aa2f296caac4d4ed6520841e SHA-256: 15a7937adee945ec4e0e55a2973229d972a9e69d50384cd0c01340a8ee910eed
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 obscure malicious redirector infrastructure. The primary malicious URL identified, https://ttraff.ru/pify?keyword=biogas+production+from+food+waste+pdf, is flagged as a known malicious redirector. This suggests the document is intended to lure users into clicking through to malicious sites, likely for phishing or malware distribution.

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=biogas+production+from+food+waste+pdf
    • http://files.goudenkolibri.nl/uploads/1/3/1/3/131379748/jazisu_puvuxadolu.pdf
    • http://files.brucedouglasreevesauthor.com/uploads/1/3/0/8/130873997/5cfa47.pdf
    • http://vubofimur.susanamons.com/uploads/1/3/2/7/132740373/5558252.pdf
    • http://jasef.traininghousecalls.com/uploads/1/3/0/8/130874332/76632.pdf
    • http://files.mscommons.com/uploads/1/3/0/7/130775027/9322445.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6753/9605/files/joburajenila.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/76957488457.pdf
    • https://cdn.shopify.com/s/files/1/0431/2721/0144/files/english_amharic_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0435/2943/7344/files/yahoo_messenger_old_version_9.pdf
    • https://cdn.shopify.com/s/files/1/0440/3268/8293/files/jodafowabo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0532/9064/files/comparative_advantage_practice_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/9029/7507/files/juxozuwen.pdf
    • https://cdn.shopify.com/s/files/1/0438/3368/8226/files/wefaxatuwibagu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9173/9295/files/75749639276.pdf
    • https://cdn.shopify.com/s/files/1/0437/2670/0696/files/95151366345.pdf
    • https://cdn.shopify.com/s/files/1/0455/7596/2789/files/english_reading_stories_for_beginners.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_off0000bc7a.bin
e073265c3fac745f625cc4163843753b87fdbfca82c0fdfe522a8a12f07311dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC7A 5584 bytes
font_01_sfnt_off0000cf7b.bin
98a1d04bcd82c6e6061fb162c6c72faffb4de4829a1ac5f5bd27b2a5cbf495d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7B 10168 bytes

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