Malicious PDF — malware analysis report

Static analysis result for SHA-256 641fefe8da2404b8…

MALICIOUS

PDF

36.7 KB Created: 2020-09-08 16:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7879cc8f28151d8c2562105fb24369e2 SHA-1: b1fca3b5fc79b3fb9a2d798008418d094db39b9d SHA-256: 641fefe8da2404b82236ed4afa1466f96702b4ec6a839518386b958b8de24fe1
154 Risk Score

Malware Insights

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

This PDF document is identified as malicious due to its inclusion of a link to a known malicious redirector infrastructure, disguised as a 'construction daywork sheet template'. The document also contains a large number of external PDF links, suggesting it is part of a link farm designed to distribute malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or redirection attempt, likely leveraging embedded JavaScript for its functionality.

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.club/pify?keyword=construction+daywork+sheet+template
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/529385_f40a086d5aeb449b9601c17f514d37da.pdf
    • https://static.usrfiles.com/ugd/1f5cef_d5fa1f3de5c740599d2a50900d3b212b.pdf
    • https://static.usrfiles.com/ugd/54b9a1_89850a17235c4ad58924a2d5f2d5b402.pdf
    • https://static.usrfiles.com/ugd/e3834b_ed83def50bc4472ab1940b641ee6af27.pdf
    • https://static.usrfiles.com/ugd/9b7d8a_39c77552e6374554ab9e5ed236930b0a.pdf
    • https://cdn.shopify.com/s/files/1/0430/1615/9385/files/70853168331.pdf
    • https://cdn.shopify.com/s/files/1/0436/5543/0302/files/jezemepegewedemava.pdf
    • https://cdn.shopify.com/s/files/1/0429/2152/5407/files/arithmetic_sequence_worksheet_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/1045/7753/files/64666238294.pdf
    • https://cdn.shopify.com/s/files/1/0434/0498/4483/files/gigorebizawuzabojezota.pdf
    • https://cdn.shopify.com/s/files/1/0431/4886/9789/files/48325313751.pdf
    • https://cdn.shopify.com/s/files/1/0434/5082/6905/files/93743935025.pdf
    • https://cdn.shopify.com/s/files/1/0438/9833/9496/files/qigong_breathing_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0430/8254/7361/files/capsaicina_beneficios.pdf
    • https://cdn.shopify.com/s/files/1/0428/8000/8359/files/acapella_maker_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0431/1433/2309/files/2777892337.pdf
    • https://cdn.shopify.com/s/files/1/0431/4542/9160/files/ravixajisosefuwewubonazox.pdf
    • https://cdn.shopify.com/s/files/1/0440/2331/6630/files/70798048007.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005211.bin
fb96c43a2e157bca847c4c94576d40e859d553854f1b879c71bf0d9a403db5b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5211 5476 bytes
font_01_sfnt_off00006499.bin
ac748aec4db3d773970e798177c0faea17c204b54d59343edf22e2c005980b80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6499 9788 bytes

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