Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e419aa6287add19…

MALICIOUS

PDF

52.8 KB Created: 2020-08-24 04:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a24f3f9b1ef3eb659ef5d6f5a287526 SHA-1: 776d47fdc3269faad97b2ba23f9e7d9fbad5c97f SHA-256: 6e419aa6287add19c43180f32193eed8a5477e94be82c08abe17f9e4352c9002
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link that redirects to known malicious infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. Additionally, the document exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be tricking the user into clicking the malicious link, likely leading to further compromise.

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=conclusion+scientific+report+example
    • http://files.lefthandedgolfaustralia.com/uploads/1/3/1/4/131408537/mutasazegiratiz.pdf
    • http://nixebipef.annedallrobson.com/uploads/1/3/0/7/130776486/b669130af8958.pdf
    • http://files.ijcmr.com/uploads/1/3/1/4/131412603/lukidelutex.pdf
    • http://jerazeb.zandq.com/uploads/1/3/0/9/130969204/wigevewuri_mileluleninule.pdf
    • http://files.wildoncherrysalon.com/uploads/1/3/0/8/130814205/4960301.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0436/6965/1606/files/free_2019_yearly_calendar_template_excel.pdf
    • https://cdn.shopify.com/s/files/1/0433/9512/1319/files/rockwell_differential_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/7573/9560/files/3810891310.pdf
    • https://cdn.shopify.com/s/files/1/0465/9429/3925/files/77012701725.pdf
    • https://cdn.shopify.com/s/files/1/0427/3537/0407/files/english_sentences_for_daily_use.pdf
    • https://cdn.shopify.com/s/files/1/0431/7023/4519/files/88743517019.pdf
    • https://cdn.shopify.com/s/files/1/0440/7335/3381/files/fepipibekakajofa.pdf
    • https://cdn.shopify.com/s/files/1/0433/6078/0443/files/perewegidosu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0333/0209/files/definition_of_reading_aloud.pdf
    • https://cdn.shopify.com/s/files/1/0439/9264/5790/files/suneg.pdf
    • https://cdn.shopify.com/s/files/1/0433/9440/0414/files/torijiwovixeb.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008356.bin
8acaab35290aa0a353634f7b1c6ec906861202afbec0b8d6faac7c259851864c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8356 5136 bytes
font_01_sfnt_off000094b4.bin
5b6c9b8ca43b0bff4e17156241ea2917375fff50d6cd06cb3c9d9c56d6a6af5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94B4 10304 bytes
font_02_sfnt_off0000b7d8.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D8 4324 bytes

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