Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea556c522cce80c…

MALICIOUS

PDF

43.0 KB Created: 2020-07-21 00:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34376b3895cff890892ece3f419a5792 SHA-1: 8e6e0ac3db3a1a272e626ad48214815ff22efa1c SHA-256: 8ea556c522cce80ccc9afef88ddf45ebe1584a05d1fd861c44f0030201360dad
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains numerous links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'grid computing pdf download'. The presence of a link farm and a malicious redirector indicates an attempt to drive traffic to malicious infrastructure, likely for further exploitation or phishing.

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.ru/wb?keyword=grid%20computing%20pdf%20download
    • http://files.longislandswimschool.com/uploads/1/3/0/9/130969986/girukuxesevunipopa.pdf
    • http://files.happyhomestead.co.uk/uploads/1/3/1/8/131872032/guraluloje-zalelu.pdf
    • http://files.diaryofadesitck.com/uploads/1/3/1/3/131380001/fakus.pdf
    • http://files.happyhomestead.co.uk/
    • https://cdn.shopify.com/s/files/1/0434/2621/8134/files/94306154360.pdf
    • https://cdn.shopify.com/s/files/1/0437/6975/7850/files/fugorabileve.pdf
    • https://cdn.shopify.com/s/files/1/0429/4282/4614/files/rotew.pdf
    • https://zabosododuge.files.wordpress.com/2020/07/82109109336.pdf
    • https://pijezomupa.files.wordpress.com/2020/06/rujojijopapagatut.pdf
    • https://xalimiganifa.files.wordpress.com/2020/06/xotasoruremeluruk.pdf
    • https://furaxefij152290709.files.wordpress.com/2020/07/25176188120.pdf
    • https://repinugemu.files.wordpress.com/2020/07/gopijuxeritoba.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/niriliruvurufuwupaku.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/30319567480.pdf
    • https://cdn.shopify.com/s/files/1/0430/2284/4067/files/fizezekugigogorubeka.pdf
    • https://cdn.shopify.com/s/files/1/0429/0756/6239/files/jezagexinejajogesizo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8475/0747/files/luxowowike.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8003629611.pdf
    • https://cdn.shopify.com/s/files/1/0429/8794/6133/files/tekubopodubixaf.pdf
    • https://cdn.shopify.com/s/files/1/0430/5901/9927/files/veponexumanun.pdf
    • https://cdn.shopify.com/s/files/1/0428/0582/1599/files/zoragopuji.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_off000069af.bin
2b167f7c7b5b2a0ce881e5c914a2bff7fc7dc9e49256bd09e70744a07d5dafab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69AF 5184 bytes
font_01_sfnt_off00007b4d.bin
59677ab3b7624cf7609a4ebbe892ee53c7eb104de92c775bb037833f8a68fc25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B4D 10352 bytes

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