Malicious PDF — malware analysis report

Static analysis result for SHA-256 a009aa74ed083c2a…

MALICIOUS

PDF

49.5 KB Created: 2020-08-19 05:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db8cb6fbfb01987d272c3af5fba7dbf5 SHA-1: ab4e804e41f0545ba6d82423ed6ca7bbf9ec421a SHA-256: a009aa74ed083c2a663c14ac3a2a6339fe30d401ef0c9c4c697fe8ac2787185b
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it directs users to a known malicious URL. The document body, though heavily obfuscated, contains text related to 'Cervical fracture treatment guidelines' and the malicious URL itself. The PDF_SEO_LINK_FARM heuristic suggests the PDF is part of a larger link farm designed to attract traffic, likely for malicious purposes. The ML_NYX_PDF_MALICIOUS classifier also strongly indicates malicious intent.

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.cc/pify?keyword=cervical+fracture+treatment+guidelines
    • http://files.skylercoleallen.com/uploads/1/3/0/7/130740256/wawirupa-wugolibiwulagu-takur.pdf
    • http://files.tanyafazal.com/uploads/1/3/0/8/130874543/6ea47fd205b88ea.pdf
    • http://files.advancedceramicproducts.com/uploads/1/3/1/4/131453248/1068633.pdf
    • http://files.gnbbarassn.org/uploads/1/3/1/4/131408502/9007833.pdf
    • https://cdn.shopify.com/s/files/1/0435/5080/2081/files/tibowibekoziwakalokeberag.pdf
    • https://cdn.shopify.com/s/files/1/0429/8434/1657/files/vimexusalox.pdf
    • https://cdn.shopify.com/s/files/1/0436/9983/0952/files/83764581117.pdf
    • https://cdn.shopify.com/s/files/1/0433/8316/0995/files/amabile_1996_creativity_in_context.pdf
    • https://cdn.shopify.com/s/files/1/0429/4495/4527/files/zimakowid.pdf
    • https://cdn.shopify.com/s/files/1/0434/1117/7629/files/19531459981.pdf
    • https://cdn.shopify.com/s/files/1/0450/9886/0707/files/big_carding_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0435/4893/4295/files/papositububafazuxanejes.pdf
    • https://cdn.shopify.com/s/files/1/0435/4818/0634/files/xitiwejewedet.pdf
    • https://cdn.shopify.com/s/files/1/0428/9911/2095/files/dovipuborikorawowirafekat.pdf
    • https://cdn.shopify.com/s/files/1/0440/5762/4726/files/limpeza_espiritual_21_dias_arcanjo_miguel.pdf
    • https://cdn.shopify.com/s/files/1/0433/6245/1611/files/94634464127.pdf
    • https://cdn.shopify.com/s/files/1/0436/0624/5539/files/bikhre_moti_urdu_free_download.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_off000084ac.bin
16e19978c4d7bee1d60469429a8298b92f481baf13f8c4a7b127f7dbf1424fd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84AC 5304 bytes
font_01_sfnt_off0000969b.bin
20334ae4d932197bb80f29a274625c6c90fd7ed1ebc0052fa25040880460e825		 pdf-font-stream PDF embedded font (sfnt) at offset 0x969B 9900 bytes

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