Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d27ed993ec859d5…

MALICIOUS

PDF

42.4 KB Created: 2020-08-05 22:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebdd6797c73855d727aea0f5e20bd75d SHA-1: 2369aa53f9e45ed6f466405a55d786edca47106d SHA-256: 8d27ed993ec859d509212a82becd877b38ab9491b2b54353dfac16c7144767eb
154 Risk Score

Malware Insights

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

The PDF contains embedded links that are part of a link farm, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure related to a dictionary resource, and the malicious URL is directly embedded within it. This suggests a social engineering attack to redirect users to malicious content.

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=the+oxford+dictionary+of+science+fiction+pdf
    • http://files.littlebundleandco.com/uploads/1/3/1/4/131453177/dugoval.pdf
    • http://files.shantellsnaturalhair.com/uploads/1/3/1/4/131454106/25dcc21.pdf
    • http://files.archvizblender.com/uploads/1/3/0/7/130740017/baxopobeb-birufa.pdf
    • http://files.jondavidson.com/uploads/1/3/0/7/130739155/xalix.pdf
    • http://files.juniorleaguemcallen.org/uploads/1/3/1/1/131164129/dea44.pdf
    • https://cdn.shopify.com/s/files/1/0438/5849/3600/files/bogukilori.pdf
    • https://cdn.shopify.com/s/files/1/0433/4324/9576/files/vokutowarivutiramorusez.pdf
    • https://cdn.shopify.com/s/files/1/0431/9880/8224/files/murexalimuvukevetop.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/76102764406.pdf
    • https://cdn.shopify.com/s/files/1/0435/9458/0136/files/exceptional_c_47.pdf
    • https://cdn.shopify.com/s/files/1/0432/9121/3980/files/62372898604.pdf
    • https://cdn.shopify.com/s/files/1/0429/6730/2295/files/79006982037.pdf
    • https://cdn.shopify.com/s/files/1/0435/7668/8799/files/nividanebagotoleb.pdf
    • https://cdn.shopify.com/s/files/1/0433/9014/0581/files/pokonotuwobe.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4024/files/3207994162.pdf
    • https://cdn.shopify.com/s/files/1/0431/7193/8453/files/nojiza.pdf
    • https://cdn.shopify.com/s/files/1/0428/5884/0223/files/wegetopedopogarorelutit.pdf
    • https://cdn.shopify.com/s/files/1/0431/2619/4336/files/45996792089.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/99594865370.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_off000066b1.bin
ae302d7db3cc7d34c8cba924271db7c84759941a95622aa8c83bc8e403473864		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66B1 5332 bytes
font_01_sfnt_off000078dd.bin
016bb7e211d0bf16ded0e52c9195c1ae21e88df92fcf3807e336c83d8e20a9af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78DD 10340 bytes

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