Malicious PDF — malware analysis report

Static analysis result for SHA-256 beda31f3162f7dac…

MALICIOUS

PDF

46.8 KB Created: 2020-07-23 02:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1372492777e677063c05e1f6bcd8180c SHA-1: 462a9ec69a21fb7d32aa35649570f3f55698ae88 SHA-256: beda31f3162f7dac838341552e17e16d99d7e6e0fa06420f0f01e3f1eb1944d5
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com. One of these links, ttraff.ru, is identified as a malicious redirector. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of numerous external links indicates a phishing or SEO poisoning attempt to drive traffic to malicious sites.

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=phrasal%20verbs%20lista%20completa%20traduzida%20pdf
    • http://files.jacksonvilleartistsguild.org/uploads/1/3/1/4/131438299/d40116243.pdf
    • http://files.rustlingmeadows.com/uploads/1/3/1/3/131379039/71afd2a.pdf
    • http://files.bullengarookadultriders.com/uploads/1/3/2/6/132681596/fomapofegaro-wopigadazodup-zevevamer-tirexilagenizo.pdf
    • http://files.bullengarookadultriders.co
    • https://cdn.shopify.com/s/files/1/0429/3342/0195/files/gekaduruvinunivuxavid.pdf
    • https://cdn.shopify.com/s/files/1/0433/3728/5797/files/nexunuzeru.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovetutokukike.pdf
    • https://cdn.shopify.com/s/files/1/0433/4842/6920/files/38837706821.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lofolevunukexus.pdf
    • https://bazebibirolo.files.wordpress.com/2020/07/48244650155.pdf
    • https://wiwozufof.files.wordpress.com/2020/06/sefidogixokagisutenade.pdf
    • https://zaketemi331016996.files.wordpress.com/2020/07/65234708112.pdf
    • https://vupovinenese.files.wordpress.com/2020/07/sikemuju.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rixaraxamixenapo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6717/9165/files/putala.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jidaxuno.pdf
    • https://cdn.shopify.com/s/files/1/0432/2859/4344/files/tejej.pdf
    • https://cdn.shopify.com/s/files/1/0431/7780/3931/files/65441067371.pdf
    • https://cdn.shopify.com/s/files/1/0429/6045/3785/files/61879807591.pdf
    • https://cdn.shopify.com/s/files/1/0432/2993/7832/files/mefokugivedorajaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/0954/8188/files/pixizuxa.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_off00007866.bin
1f491eeb272ef112c61cd4ddb782b50efeb1c8128c14c245dfc6d743ecf40bb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7866 5420 bytes
font_01_sfnt_off00008ad7.bin
a8929c38a58988e24b3051cb971fd7ca7c6c85544ba97f1ae683ba42e2bc4da6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AD7 9992 bytes

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