Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c89b15ad1f932f…

MALICIOUS

PDF

40.0 KB Created: 2020-08-08 12:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: feb5d016589e3bada847d710893309c2 SHA-1: 22030a20a2946b01f470d7fd2d45e5af74e45ace SHA-256: 83c89b15ad1f932f4abed09acca714c4e2903cf84661e7193506765f1228cad4
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, characteristic of a link farm. One of the primary links, 'ttraff.ru', is identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lure users to malicious infrastructure. No scripts were extracted, but the presence of numerous links suggests an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes.

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/pify?keyword=concerto+di+aranjuez+spartito+per+chitarra+pdf
    • http://files.mchsapchemistry.com/uploads/1/3/1/4/131406234/vopikexatemixox.pdf
    • http://files.drenner.net/uploads/1/3/1/4/131453065/28835.pdf
    • http://files.crazydaisymarketing.com/uploads/1/3/1/4/131407918/2752167.pdf
    • http://fazabikif.levelten.shop/uploads/1/3/2/3/132303382/xifolavabo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/1705/2053/files/turning_back_the_clock_umberto_eco.pdf
    • https://cdn.shopify.com/s/files/1/0429/4852/6246/files/zagubo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tujekozovazufurujujazer.pdf
    • https://cdn.shopify.com/s/files/1/0435/3789/1477/files/woc_pneumonia_pada_anak.pdf
    • https://cdn.shopify.com/s/files/1/0438/5567/5542/files/xoxegufaf.pdf
    • https://cdn.shopify.com/s/files/1/0429/5553/8591/files/case_study_method.pdf
    • https://cdn.shopify.com/s/files/1/0428/7925/4694/files/54208576438.pdf
    • https://cdn.shopify.com/s/files/1/0432/2931/5229/files/kubed.pdf
    • https://cdn.shopify.com/s/files/1/0428/9472/1187/files/komag.pdf
    • https://cdn.shopify.com/s/files/1/0431/4329/9234/files/rabinegojuwegebasupitabi.pdf
    • https://cdn.shopify.com/s/files/1/0429/7929/5385/files/67938840678.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/dujotugizapol.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15125842299.pdf
    • https://cdn.shopify.com/s/files/1/0431/5545/6164/files/62816105492.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f2c.bin
c027a48f3e47446a4f14dda0a71c81ec1531e94c98a9b5420b3caf66c95c90cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F2C 5240 bytes
font_01_sfnt_off00006101.bin
268e9c1d84e098d54f83f655b935fe2ecd3a09939d12b8cb996de0721e360632		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6101 10644 bytes
font_02_sfnt_off0000846c.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x846C 4324 bytes

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