Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f49b86eeaa53f34…

MALICIOUS

PDF

54.2 KB Created: 2020-08-16 23:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ba40143bf8add3eda0c63137392af45 SHA-1: 2c6f63b0f5188ad933a29e80db6f94e31904fc82 SHA-256: 0f49b86eeaa53f34370c1d8928b0c84d596d8b5a167cb75c6b991f21e6068a72
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, appears to contain the same redirector URL and a list of other PDF links, suggesting a link farm or redirection scheme. The ML classifier also flagged this PDF as malicious with high confidence.

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=sasural+simar+ka+serial+episodes
    • http://kepomu.andweber.com/uploads/1/3/2/7/132741555/lamotasivaso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0702/5060/files/fukevebove.pdf
    • https://cdn.shopify.com/s/files/1/0430/9978/3319/files/36404174736.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/koxumugude.pdf
    • https://cdn.shopify.com/s/files/1/0428/2348/3548/files/square_root_of_180_simplified.pdf
    • https://cdn.shopify.com/s/files/1/0433/9816/8725/files/31908322843.pdf
    • https://cdn.shopify.com/s/files/1/0437/8312/7201/files/99873071551.pdf
    • https://cdn.shopify.com/s/files/1/0429/3171/6262/files/el_aprendizaje_basado_en_proyectos.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/35299115414.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/63071093727.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0487/files/nubibozusozujelisatinor.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_off0000952e.bin
48d79b5d865a686b3c8dafb6d2ba7275e4102e5abfb6fd126cd00247bec7ccb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x952E 5272 bytes
font_01_sfnt_off0000a6fc.bin
7802ed672a3d4e5729c70cb53df97285ace6d3b5621dd2beb6b7982d80336a85		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6FC 10972 bytes

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