Malicious PDF — malware analysis report

Static analysis result for SHA-256 25901c355fd6078a…

MALICIOUS

PDF

42.1 KB Created: 2020-08-06 03:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fd5850ea6abf0203be5735152f4d460 SHA-1: c0737a041d4884b37fcfd2d507f15a5e04f112b7 SHA-256: 25901c355fd6078abac36f4672734b44a90c357179e8e70dc7d3ac90be709b82
152 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and heuristics indicate it contains a malicious redirector link. The document body contains obfuscated text and a URL pointing to a redirector service, which likely leads to a malicious payload. The presence of numerous links, including those to the redirector, suggests a link farm or redirection attack. No scripts were extracted from this sample.

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=body+parts+esl+pdf
    • http://pimig.strozzimeowvellous.com/uploads/1/3/2/7/132740541/romitovijoz_kijimusefiwi_vuvonisowu.pdf
    • http://files.misspankhurstslearningspace.com/uploads/1/3/0/7/130739564/82f1ff.pdf
    • http://files.mcallikat.com/uploads/1/3/2/6/132683475/6516024.pdf
    • http://files.valentineorthotics.com/uploads/1/3/0/8/130814017/kakotipaxadovufas.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7100/files/importance_of_crop_rotation_in_agriculture.pdf
    • https://cdn.shopify.com/s/files/1/0438/2962/4982/files/vazalubusexujulesuli.pdf
    • https://cdn.shopify.com/s/files/1/0435/0276/4184/files/defesater.pdf
    • https://cdn.shopify.com/s/files/1/0432/6942/3269/files/90036951235.pdf
    • https://cdn.shopify.com/s/files/1/0431/1898/5370/files/top_down_and_bottom_up_approach.pdf
    • https://cdn.shopify.com/s/files/1/0431/5794/6519/files/689346118.pdf
    • https://cdn.shopify.com/s/files/1/0429/5449/0012/files/xolusetuj.pdf
    • https://cdn.shopify.com/s/files/1/0429/5193/4108/files/64495215308.pdf
    • https://cdn.shopify.com/s/files/1/0440/1129/0782/files/jorasusokawoxekijinuzori.pdf
    • https://cdn.shopify.com/s/files/1/0431/4864/0418/files/kuwosora.pdf
    • https://cdn.shopify.com/s/files/1/0431/3461/5708/files/nuzise.pdf
    • https://cdn.shopify.com/s/files/1/0430/1327/5811/files/37127855018.pdf
    • https://cdn.shopify.com/s/files/1/0431/6859/6117/files/kupajipuxeli.pdf
    • https://cdn.shopify.com/s/files/1/0429/4891/9450/files/bibuburatopituxejuned.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_off00006500.bin
d5e691bcc5d07f45e81046642f4116fe8d96a7476d835e3f34e9fe4de338d4f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6500 5188 bytes
font_01_sfnt_off000076bf.bin
cc397dfda4faa8fb37ab4591405a3b2a2a9fbda5b8e78947ee0dd478050a84bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76BF 11128 bytes

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