Malicious PDF — malware analysis report

Static analysis result for SHA-256 66921ce083f42434…

MALICIOUS

PDF

40.7 KB Created: 2020-08-11 08:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94ceb932bb1faf68be3d151d220380a6 SHA-1: a50f09a4f2bccc2cfccd1c2639087348cc6b1113 SHA-256: 66921ce083f424345d15467be11f31f207a50fb108e43384a1f67d8c4d58ca0c
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector URL. The document body, though obfuscated, contains text suggesting it is a 'sample business valuation report pdf' and includes the malicious redirector URL. The presence of many external PDF links, some benign and some unknown, suggests a link farm or redirection strategy to obscure the ultimate destination.

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.com/pify?keyword=sample+business+valuation+report+pdf
    • http://files.nolimitcombatives.com/uploads/1/3/0/8/130874361/tadikokufemaf.pdf
    • http://files.gilescobaptist.org/uploads/1/3/1/1/131163620/2872859.pdf
    • http://towiga.ysgolgwernymynydd.com/uploads/1/3/1/3/131383483/noxelapip.pdf
    • http://files.pinecatsbaseballacademy.com/uploads/1/3/0/7/130775627/5134357.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6132/1634/files/kuguxolal.pdf
    • https://cdn.shopify.com/s/files/1/0430/3287/1074/files/les_collectivits_territoriales_en_70_fiches_gratuit.pdf
    • https://cdn.shopify.com/s/files/1/0428/5700/5215/files/miralobojuwizasigubofo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6649/1041/files/botany_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0439/3785/7691/files/getting_to_yes_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/4764/8406/files/kapitojiduvidawinesif.pdf
    • https://cdn.shopify.com/s/files/1/0436/8000/6294/files/zusuzuvoli.pdf
    • https://cdn.shopify.com/s/files/1/0431/3733/5464/files/suxubotuzanuwifevodowew.pdf
    • https://cdn.shopify.com/s/files/1/0431/5951/9387/files/baby_boy_names_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/0281/4876/files/telewelavovateb.pdf
    • https://cdn.shopify.com/s/files/1/0434/0757/3157/files/lagoxijuxufaji.pdf
    • https://cdn.shopify.com/s/files/1/0432/5205/6227/files/vabibedewomudoj.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_off00005fbb.bin
42b59adeab370e6630e6e1524942d5b2b6f6c718fd16eda850e0c4bb2bd58b79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FBB 5492 bytes
font_01_sfnt_off0000724b.bin
181eaf6566a2c61603ff02a0002a789c76d77227d37d9aab6231a7f6d4457784		 pdf-font-stream PDF embedded font (sfnt) at offset 0x724B 10460 bytes

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