Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea57364476411328…

MALICIOUS

PDF

43.7 KB Created: 2020-08-21 15:39:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da2ef5c68d8c1368ce4ba8926bf80ca8 SHA-1: 8969b46e5cb74f8eae1d040a0c16e2d49244e595 SHA-256: ea5736447641132853fb15c7f365f32bdb06479085eea54b909617c8e321f205
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector to 'ttraff.com'. The document body, though malformed, includes the same URL, suggesting an attempt to lure the user to a malicious site. The ML classifier strongly supports the malicious verdict.

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.com/pify?keyword=centos+7+server+guide+pdf
    • http://lilomi.pbjshowhorses.com/uploads/1/3/1/3/131383483/doziku-metelon-sijiwa.pdf
    • http://favib.treatingcbs.com/uploads/1/3/1/3/131398560/409df.pdf
    • http://wusapa.destinybrownphotography.com/uploads/1/3/0/7/130776008/wofifipubagama.pdf
    • https://cdn.shopify.com/s/files/1/0435/7275/6648/files/second_life_map.pdf
    • https://cdn.shopify.com/s/files/1/0433/5727/4270/files/famuvaboje.pdf
    • https://cdn.shopify.com/s/files/1/0439/0954/6136/files/aircraft_structures_for_engineering_students_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/8749/5321/files/irs_form_2553_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0436/5778/9593/files/85831015635.pdf
    • https://cdn.shopify.com/s/files/1/0430/5797/1354/files/chinese_zodiac_movie_in_tamilyogi.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/kasamilusobi.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_off000068d1.bin
f40a8f0c95a336ee3e435a0ba187de0ead263ba63ee0144e260c7a049e1065ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68D1 5012 bytes
font_01_sfnt_off000079fc.bin
1fdad6880eae6f4e5c442d77ab193c677406fc535cd9d5036fb09b0a336eb0c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79FC 12580 bytes

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