Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3dc58e8b941762e…

MALICIOUS

PDF

53.7 KB Created: 2020-08-24 14:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a80b70087351c263343743a200ce01b SHA-1: 6b191a4471a2565810efdc5bb95c005571cb72f6 SHA-256: b3dc58e8b941762efa45432dac2056e9bc07e16f71faa23084d987db4c6e22ca
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Libros sobre angeles y demonios pdf' and a URL that appears to be part of a link farm designed to attract search engine traffic. The primary malicious link is https://ttraff.cc/pify?keyword=libros+sobre+angeles+y+demonios+pdf, which likely leads to further malicious content. The ML classifier strongly indicated maliciousness.

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=libros+sobre+angeles+y+demonios+pdf
    • http://kizadali.chrisvosters.com/uploads/1/3/2/6/132682717/3289191ba36.pdf
    • http://files.transitionintowellness.com/uploads/1/3/2/8/132815882/cd64184dc7.pdf
    • http://kogejor.questalpacas.com/uploads/1/3/1/3/131383314/3402360.pdf
    • http://witufu.pchschoirs.com/uploads/1/3/0/8/130814017/7582284.pdf
    • http://ginedu.drhcustomhomesandremodeling.com/uploads/1/3/1/1/131163651/5963796.pdf
    • https://cdn.shopify.com/s/files/1/0432/7574/7483/files/community_worksheets_for_preschool.pdf
    • https://cdn.shopify.com/s/files/1/0434/0963/7530/files/tajekerebu.pdf
    • https://cdn.shopify.com/s/files/1/0437/5547/1006/files/94509829715.pdf
    • https://cdn.shopify.com/s/files/1/0429/2630/9535/files/70026947811.pdf
    • https://cdn.shopify.com/s/files/1/0428/7479/8247/files/15431599109.pdf
    • https://cdn.shopify.com/s/files/1/0432/0670/5316/files/58990689683.pdf
    • https://cdn.shopify.com/s/files/1/0429/2611/2927/files/adobe_reader_merge_documents.pdf
    • https://cdn.shopify.com/s/files/1/0433/9548/1750/files/pokosilavademipawizobejag.pdf
    • https://cdn.shopify.com/s/files/1/0437/1791/8870/files/ms_access_2020_database_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/9943672230.pdf
    • https://cdn.shopify.com/s/files/1/0440/5595/3558/files/ariel_princess_story.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007921.bin
c9963bcb11c7e08b44187f0735d54d65f11cb41d6aca26a17038f35884bafb4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7921 5544 bytes
font_01_sfnt_off00008be2.bin
6bc245506dbcbc06adf99a1beafae03bc62bba61c6dd29b678470a7584595928		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BE2 11736 bytes
font_02_sfnt_off0000b24d.bin
f48e048927f4ab0e535fa64d7eded4ccbd2294e97bc270406cdb4ec60522c297		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB24D 16328 bytes

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