Malicious PDF — malware analysis report

Static analysis result for SHA-256 67816e5836dd2023…

MALICIOUS

PDF

42.9 KB Created: 2020-08-13 21:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b48d65bdc69c556068d51feb9ada0d0 SHA-1: 8efe930154e3472abba9c7444c4350c3e17b0bf5 SHA-256: 67816e5836dd2023a773e73aa46f30c34e7fbab0415ad790d6e1144e6a9adbb3
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 external PDF files hosted on various domains. One of the primary links directs to a known malicious redirector, suggesting an attempt to lead the user to malicious content. The ML classifier also 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=jogos+para+uma+aprendizagem+significativa+pdf
    • http://files.greatalnefolk.org.uk/uploads/1/3/1/1/131163684/099c931bf4f0.pdf
    • http://files.anugerahbaptistchurch.org/uploads/1/3/0/9/130969874/tefulewixafores.pdf
    • http://gabij.bassreevesconference.com/uploads/1/3/1/3/131381612/19494ebed57bb.pdf
    • http://sijojivog.eskotrails.com/uploads/1/3/1/4/131453850/sejubafalezelakivisu.pdf
    • http://peranume.leducdramasociety.ca/uploads/1/3/0/8/130874493/5410720.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/6511/4775/files/japupasatenakal.pdf
    • https://cdn.shopify.com/s/files/1/0438/3234/4736/files/muzoku.pdf
    • https://cdn.shopify.com/s/files/1/0437/8014/5313/files/gobud.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/93861148098.pdf
    • https://cdn.shopify.com/s/files/1/0432/0965/4436/files/86135120927.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/aditya_hridayam_stotram.pdf
    • https://cdn.shopify.com/s/files/1/0433/7447/7464/files/zukusinawigedokesat.pdf
    • https://cdn.shopify.com/s/files/1/0435/8812/4829/files/10684896769.pdf
    • https://cdn.shopify.com/s/files/1/0439/2137/5387/files/fap_titans_cheats.pdf
    • https://cdn.shopify.com/s/files/1/0432/4887/7736/files/pewuvejogejanuvuju.pdf
    • https://cdn.shopify.com/s/files/1/0431/7931/1253/files/8445347991.pdf
    • https://cdn.shopify.com/s/files/1/0433/4914/7816/files/jedopuliwis.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/34078282625.pdf
    • https://cdn.shopify.com/s/files/1/0448/0250/6909/files/effectiveness_of_celebrity_endorsement.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_off000053cf.bin
6188db2303c73559fcf1fe3890f74ec724a1125deceaeeb0b66034b4d82a9101		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53CF 5424 bytes
font_01_sfnt_off0000663f.bin
57870541c71f850105f89331976426d77e029f99c3ab6bb2631676591ce9fd1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x663F 14024 bytes
font_02_sfnt_off00008e1e.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E1E 4324 bytes

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