Malicious PDF — malware analysis report

Static analysis result for SHA-256 0afbe3c7c1c598c0…

MALICIOUS

PDF

42.3 KB Created: 2020-08-13 13:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 698e5f4211803e6324f03042f3bc3754 SHA-1: 9c882e925e9a9d6bf5f84aea32ce26d353c3bd96 SHA-256: 0afbe3c7c1c598c0d668e334ff640d575e66329b973cbd78dd2d6e93ffd625f7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a mass of external links, with one prominent link pointing to a malicious redirector infrastructure. The document body text and embedded links suggest a lure for abstract reasoning tests, likely to drive traffic to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate a malicious intent to redirect users to potentially harmful content.

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.com/wb?keyword=free%20abstract%20reasoning%20test%20with%20answers%20and%20explanation%20pdf
    • http://files.hotelshopuk.com/uploads/1/3/0/9/130969428/guvem-revoberokasesar-kuzorad.pdf
    • http://files.raquelmeraki.com/uploads/1/3/2/7/132740860/3354846.pdf
    • http://files.perciakwedding.com/uploads/1/3/0/8/130813427/5621979.pdf
    • http://files.lakoniaultrarunning.com/uploads/1/3/0/7/130739802/kewasotavet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/9040/1687/files/76600042001.pdf
    • https://cdn.shopify.com/s/files/1/0433/6926/7354/files/sabodi.pdf
    • https://cdn.shopify.com/s/files/1/0430/3136/3747/files/arkan_e_hajj_in_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3477/9553/files/learn_python_the_hard_way_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/0294/3909/files/lofujetijekikakaxexurag.pdf
    • https://cdn.shopify.com/s/files/1/0427/9356/6364/files/vurozawumuludedoma.pdf
    • https://cdn.shopify.com/s/files/1/0446/7671/0563/files/nemoruragusopegoketawiras.pdf
    • https://cdn.shopify.com/s/files/1/0431/5332/6242/files/famanepenarorigisatanev.pdf
    • https://cdn.shopify.com/s/files/1/0449/5409/1675/files/toastmasters_competent_communicator_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/8145/6023/files/scott_kelby_books.pdf
    • https://cdn.shopify.com/s/files/1/0433/5491/4981/files/78985816411.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_off00006603.bin
a16a33ce448898841f5c35a5cbb880dfe396f2ed52759f75900bf12735ea19b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6603 5672 bytes
font_01_sfnt_off00007955.bin
eefd1f9d5bee0e68cb1e00b7be205541af914fa0ed7cb495d40da63e4812e998		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7955 10104 bytes

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