Malicious PDF — malware analysis report

Static analysis result for SHA-256 15e8ee80f7a8d7f1…

MALICIOUS

PDF

46.2 KB Created: 2020-08-21 14:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 863c2e6425e692f0525edb13e6114e09 SHA-1: eac8ce325c1eda61dfb7870ac93a7f7c18a8c1b2 SHA-256: 15e8ee80f7a8d7f14ab471ce41e1ab093dfa20b9479bf56eaa1a6bbd72d45204
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external resources, including a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains the URL for the malicious redirector and several other URLs that appear to be part of a link farm designed to manipulate search engine results.

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=short+persuasive+essay+on+school+uniforms
    • http://juvitet.invictund.com/uploads/1/3/2/6/132683071/tosefe-pazovupelitu.pdf
    • http://files.desmoinesfigureskatingclub.org/uploads/1/3/0/8/130814758/rawuruwigivaxape.pdf
    • http://kisesuzan.groundsquirrelbmp.com/uploads/1/3/1/8/131857114/5152494.pdf
    • http://files.partnerhc.com/uploads/1/3/2/7/132740501/baxadilaxajaxolitox.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/9933/2516/files/alfabet_grecki_wymowa.pdf
    • https://cdn.shopify.com/s/files/1/0434/7923/6774/files/good_presentation_skills.pdf
    • https://cdn.shopify.com/s/files/1/0437/7103/5809/files/vugijerixefazesir.pdf
    • https://cdn.shopify.com/s/files/1/0428/0667/3575/files/bofafodovetazujinin.pdf
    • https://cdn.shopify.com/s/files/1/0438/7235/4459/files/stewart_calculus_7th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/5636/4709/files/preparative_and_analytical_centrifugation.pdf
    • https://cdn.shopify.com/s/files/1/0438/4132/3170/files/33425866898.pdf
    • https://cdn.shopify.com/s/files/1/0433/3063/3881/files/ponuwukizulabemozome.pdf
    • https://cdn.shopify.com/s/files/1/0433/3626/9983/files/jokodavibosufajufar.pdf
    • https://cdn.shopify.com/s/files/1/0428/1214/5823/files/5227895863.pdf
    • https://cdn.shopify.com/s/files/1/0440/1790/9910/files/autobiography_worksheet.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_off00006833.bin
3d200e837be5c9400bdf4d3cffc56b3441b5069209a7a2cdf741f714fff5a225		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6833 5404 bytes
font_01_sfnt_off00007a6e.bin
719da955c333b042c11be5b15a60daeb05ac775cb861c19bf250a66529fc39de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A6E 10340 bytes
font_02_sfnt_off00009db3.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DB3 4324 bytes

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