Malicious PDF — malware analysis report

Static analysis result for SHA-256 86861b68c984edef…

MALICIOUS

PDF

49.3 KB Created: 2020-07-31 13:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58c227f6659278df8a4c5f326a901209 SHA-1: 306bc1f3854d29f0e8ddb5c88a783bde1df37e73 SHA-256: 86861b68c984edef35603c46758b4620ed6712161f35fa0d040781964a8b1922
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 redirect users to malicious sites, as indicated by the PDF_SEO_LINK_FARM and PDF_MALICIOUS_REDIRECTOR_LINK heuristics. The ML classifier also strongly flagged this PDF as malicious. The embedded links likely serve as a lure to download further malicious content or phish for credentials.

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=memoire+de+licence+en+agronomie+pdf
    • http://files.visionaryglassarts.com/uploads/1/3/0/7/130775786/suzewu-tifus-velima-xamupaxus.pdf
    • http://files.sheresemlyons.com/uploads/1/3/2/3/132303238/f358dd7433778f1.pdf
    • http://files.khaagwa.org/uploads/1/3/1/6/131637056/1681961.pdf
    • http://files.glidinghbw.co.nz/uploads/1/3/1/4/131437276/tujobufafemizub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/sujutu.pdf
    • https://cdn.shopify.com/s/files/1/0428/3406/7615/files/7779710873.pdf
    • https://cdn.shopify.com/s/files/1/0434/0688/5027/files/gajaga.pdf
    • https://cdn.shopify.com/s/files/1/0428/7656/7711/files/8887514353.pdf
    • https://cdn.shopify.com/s/files/1/0432/8423/4398/files/dipeki.pdf
    • https://cdn.shopify.com/s/files/1/0432/4841/8973/files/vatakurijozuzutira.pdf
    • https://cdn.shopify.com/s/files/1/0434/9234/3970/files/mosulul.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85286147205.pdf
    • https://cdn.shopify.com/s/files/1/0434/8385/7053/files/55416615665.pdf
    • https://cdn.shopify.com/s/files/1/0434/7772/9430/files/roduduvupa.pdf
    • https://cdn.shopify.com/s/files/1/0431/3271/5163/files/fododugagiderenomi.pdf
    • https://cdn.shopify.com/s/files/1/0430/5541/5445/files/vafulefigakakizare.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mobisibat.pdf
    • https://cdn.shopify.com/s/files/1/0432/5031/9528/files/8456266588.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_off00007dbd.bin
77f50fa729d09d9504a021923053a64385cb63b5deaa225acb73ee60decdc731		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DBD 5012 bytes
font_01_sfnt_off00008ea6.bin
015a06f2c6b294e820309813d968be091524f68a76c53c07029bba6a895742b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EA6 12100 bytes

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