Malicious PDF — malware analysis report

Static analysis result for SHA-256 1717207b4d201224…

MALICIOUS

PDF

42.8 KB Created: 2020-08-10 17:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c5fae1dd49649fe6a66c74c76e4edc1 SHA-1: 2d48afc7d79485b78f4cf1cdbe29f903bb3f963a SHA-256: 1717207b4d201224fcd3cd52b21cb15e8020ec03ddd617d6a8b922295a7aa3fc
162 Risk Score

Malware Insights

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

The sample is a PDF file that contains a large number of embedded URLs, many of which point to external resources. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK indicates that at least one of these URLs leads to known malicious redirector infrastructure. The PDF_SEO_LINK_FARM heuristic further suggests a deliberate attempt to create a large number of links, likely for SEO manipulation or to host a large number of phishing/malware lures. The ML_NYX_PDF_MALICIOUS score of 0.999992 strongly supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/pify?keyword=azolla+anabaena+pdf
    • http://files.oakwindhoa.com/uploads/1/3/2/6/132681698/502251708.pdf
    • http://files.burchfieldhomestead.com/uploads/1/3/1/4/131406075/7225474.pdf
    • http://files.balanceddori.com/uploads/1/3/0/7/130775953/959949.pdf
    • http://files.soulful-body-mind.com/uploads/1/3/1/6/131607075/tujef_zipise.pdf
    • http://files.susanwatt.ca/uploads/1/3/2/6/132681342/fezufamobitojol_mulakinamilenu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/2661/2378/files/94727826077.pdf
    • https://cdn.shopify.com/s/files/1/0432/0441/1556/files/48629718177.pdf
    • https://cdn.shopify.com/s/files/1/0432/6617/9230/files/rowubo.pdf
    • https://cdn.shopify.com/s/files/1/0428/5746/3964/files/54537622779.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dijovosulodomozov.pdf
    • https://cdn.shopify.com/s/files/1/0433/0523/8688/files/abdome_agudo_pediatria.pdf
    • https://cdn.shopify.com/s/files/1/0432/9937/3214/files/actos_de_comercio_y_su_clasificacion.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zobuwavidojanunixi.pdf
    • https://cdn.shopify.com/s/files/1/0433/5288/3352/files/git_stop_tracking_file.pdf
    • https://cdn.shopify.com/s/files/1/0431/6997/2384/files/change_management_framework.pdf
    • https://cdn.shopify.com/s/files/1/0431/5411/2672/files/bescherelle_conjugaison_italien_gratuit.pdf
    • https://cdn.shopify.com/s/files/1/0427/9438/5575/files/62812649513.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_off00006ab1.bin
072992df492f7636b2ac5183367e582e9e85267275990d4e7120b5d870eed565		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AB1 4940 bytes
font_01_sfnt_off00007b97.bin
96d862551127390c28a44141166f829cfb6eebf5154eb93ace7c445bfdfa7420		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B97 10220 bytes

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