Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9f96023598adb0a…

MALICIOUS

PDF

49.6 KB Created: 2020-08-22 22:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d63c3e5c18177767060fcc9e8e968e7 SHA-1: 357ebcaf5b8dfdb7874feeda9e797fdcc9ccf113 SHA-256: b9f96023598adb0aede648b389e49efa91a0e070ec759f5a9f2bb4d148593ef5
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is designed to lure users to malicious content. The document body, though heavily obfuscated, contains the same URL and references to medical guidelines, suggesting a social engineering pretext. The presence of numerous other PDF links, many pointing to Shopify domains, indicates a link farm strategy to obscure the malicious destination. The ML classifier strongly supports the malicious verdict.

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=nice+guidelines+endometriosis
    • http://zutazofog.valweedonmbe.net/uploads/1/3/0/8/130813550/bivebetuzekut.pdf
    • http://files.mathandcoding.org/uploads/1/3/1/6/131608016/wubopupabe.pdf
    • http://files.gswcs.com/uploads/1/3/1/6/131636808/6161774.pdf
    • http://files.ebenezerconyers.com/uploads/1/3/1/4/131408537/5101117.pdf
    • https://cdn.shopify.com/s/files/1/0435/5335/7985/files/53319783041.pdf
    • https://cdn.shopify.com/s/files/1/0439/5322/5886/files/81518257899.pdf
    • https://cdn.shopify.com/s/files/1/0429/5199/9637/files/franchising_code_of_conduct_report.pdf
    • https://cdn.shopify.com/s/files/1/0427/4136/6951/files/45287543548.pdf
    • https://cdn.shopify.com/s/files/1/0429/5730/8063/files/red_proto_drake_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/6903/1078/files/zemivo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8045/8144/files/1669224221.pdf
    • https://cdn.shopify.com/s/files/1/0431/7007/0690/files/meduluvasig.pdf
    • https://cdn.shopify.com/s/files/1/0429/8909/3018/files/diralotupotozedidetofoni.pdf
    • https://cdn.shopify.com/s/files/1/0437/0310/7752/files/ieee_transactions_on_cloud_computing_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34888362351.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/26443777516.pdf
    • https://cdn.shopify.com/s/files/1/0430/9162/4096/files/tipos_de_apnea_del_sueo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1390/6333/files/biology_mcq_pdf_in_bengali.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_off0000855d.bin
3160a242907e214d207964dafc3c144bc42a3301ac2f9ba7bc61cc840c797f39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x855D 5016 bytes
font_01_sfnt_off00009653.bin
cdc6f8eb2750448132e87aeebab0f269e491f861dbef367a98de0696e856d52b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9653 10336 bytes

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