Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8007b5230370dd2…

MALICIOUS

PDF

50.8 KB Created: 2020-07-09 19:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5153c1675c05e450e5feb8dc000408c SHA-1: 25dc860c4af8e68991d5113c89f236b6c2eddcf6 SHA-256: e8007b5230370dd25d957e7f7687aadae157d8e5be948f1e03ac738e6779e1a2
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body text is heavily obfuscated, but the presence of numerous external PDF links suggests a link farm or SEO poisoning attack. The primary malicious URL identified is https://ttraff.cc/wb?keyword=rotary%20encoder%20arduino%20pdf.

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/wb?keyword=rotary%20encoder%20arduino%20pdf
    • http://files.ancientpromise.org/uploads/1/3/0/7/130739567/e3245.pdf
    • http://files.doctorbewell.com/uploads/1/3/0/8/130813409/2abf0c2ca627df.pdf
    • http://files.focusedlearningsolutions.com/uploads/1/3/1/6/131636990/49d8e9.pdf
    • http://files.flogrips.com/uploads/1/3/0/9/130969742/jefigezebo-wuwagunolotupim-sinasu.pdf
    • http://files.joymcshaneoyler.com/uploads/1/3/1/3/131378816/loraxitixitu.pdf
    • http://files.kanishiawallace.com/uploads/1/3/1/4/131454109/biwoniselozewevununu.pdf
    • http://files.kristawiegand.com/uploads/1/3/2/6/132681296/10799.pdf
    • http://files.pinegrovecogop.org/uploads/1/3/0/8/130874318/de351d21ce3806f.pdf
    • https://rimawotuxina.files.wordpress.com/2020/07/budoketupuditavuriki.pdf
    • https://kiwusime.files.wordpress.com/2020/07/40508193965.pdf
    • https://zokisopewif.files.wordpress.com/2020/06/4045071463.pdf
    • https://wadedala728945907.files.wordpress.com/2020/07/fasaziwedebutupovigis.pdf
    • https://kemujemurer.files.wordpress.com/2020/06/maderugarepodosovekamoz.pdf
    • https://kurasedi.files.wordpress.com/2020/06/71828262655.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/demotufilonameviv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zutazalurofesavasa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/berujixawajibexuxutuzogar.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lutekalejore.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008764.bin
6fdc1ead44e1d93ead85c26467569ea6d3f8e5262fc19c0d9cc456ea36cc3f22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8764 4932 bytes
font_01_sfnt_off00009840.bin
1d7bedd4e544485d5a73d9631fe572c4fbbe1b7ef41977fb34ae95dff91be686		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9840 11608 bytes

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