Malicious PDF — malware analysis report

Static analysis result for SHA-256 e25737ec890f20e9…

MALICIOUS

PDF

33.0 KB Created: 2020-08-21 14:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1348df0cf6070613715d1e1078b7d08a SHA-1: ddd03b097fd73c730f3458b40793bd08cdde88d5 SHA-256: e25737ec890f20e904a6f706ed1f884747b8ddabd17d628e7668a7015a4b3308
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One of these links, https://ttraff.ru/pify?keyword=prescribing+guidelines+australia, is identified as a known malicious redirector. The ML classifier also flagged this PDF with high confidence, indicating malicious intent. The document body appears to be obfuscated or corrupted, but the presence of the malicious redirector and the link farm nature of the document strongly suggest a malicious distribution or redirection scheme.

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=prescribing+guidelines+australia
    • http://files.matlingard.com/uploads/1/3/0/9/130969448/7694554.pdf
    • http://jezapoko.hootenbio.com/uploads/1/3/1/0/131071157/fulizetawega-foxeta.pdf
    • http://files.ruthlouisesingleton.co.uk/uploads/1/3/1/8/131857115/koviwelovevapu.pdf
    • http://vakod.castlebrooketlc.ca/uploads/1/3/0/7/130775350/palepepapidizo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3070/8385/files/18586885977.pdf
    • https://cdn.shopify.com/s/files/1/0432/7548/5339/files/american_english_file_3_second_edition_teacher_s_book_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/5162/2306/files/34667050660.pdf
    • https://cdn.shopify.com/s/files/1/0428/4533/9814/files/digestion_of_protein.pdf
    • https://cdn.shopify.com/s/files/1/0431/9245/1232/files/widedetafike.pdf
    • https://cdn.shopify.com/s/files/1/0433/1739/5611/files/bach_air_on_g_string_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9483/files/vosebumuzumebelidulunajo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6563/0102/files/sozet.pdf
    • https://cdn.shopify.com/s/files/1/0430/3847/4397/files/bachon_ki_kahani_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/6737/5777/files/tunumavutakurikanewupedop.pdf
    • https://cdn.shopify.com/s/files/1/0437/1267/5995/files/6876792776.pdf
    • https://cdn.shopify.com/s/files/1/0434/6249/2324/files/mailchimp_signup_form_template.pdf
    • https://cdn.shopify.com/s/files/1/0430/0505/1029/files/57947045239.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_off0000457f.bin
c8eccc2c832d831c4c8345092bd7b2b7fee570ca209ecfff8f08dd74939ac0d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x457F 5248 bytes
font_01_sfnt_off00005751.bin
9c833f8e621bedff915e55a753baa3417562507ddc1154327b77e045feba7623		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5751 9296 bytes

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