Malicious PDF — malware analysis report

Static analysis result for SHA-256 613169b8b69aae75…

MALICIOUS

PDF

45.3 KB Created: 2020-08-14 23:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd763dbcea4a0750a93c06829e470d7c SHA-1: a5d37f5d795a12c947563546d2bd1f79c4abe162 SHA-256: 613169b8b69aae75fe160c72f3e611cefbc9a4ae653abca72312a82ea9b004f6
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of embedded links and the malicious redirector strongly suggest a phishing or malicious content distribution attempt.

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/wb?keyword=text%20to%20speech%20windows%2010%20pdf
    • http://files.niralidevgan.com/uploads/1/3/1/0/131070481/xifuxokawodikezixamo.pdf
    • http://files.bellacalore.com/uploads/1/3/0/8/130814279/mumubimogamu-fupedevumebat-ropetiwajo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/2096/6298/files/5369316837.pdf
    • https://cdn.shopify.com/s/files/1/0431/9435/1778/files/rimivokobejonetigimapi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9868/6111/files/tezizujuxujiwiferezapifaf.pdf
    • https://cdn.shopify.com/s/files/1/0427/9812/1119/files/lidepasikepizewu.pdf
    • https://cdn.shopify.com/s/files/1/0435/9992/1315/files/xigefavo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9301/7247/files/wopiterapujitenurezaduze.pdf
    • https://cdn.shopify.com/s/files/1/0433/3069/9414/files/81135585452.pdf
    • https://cdn.shopify.com/s/files/1/0432/1116/1768/files/8797325354.pdf
    • https://cdn.shopify.com/s/files/1/0431/7865/5903/files/articles_grammar_list.pdf
    • https://cdn.shopify.com/s/files/1/0434/4568/2328/files/25561279180.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_off000066e3.bin
a970eab677a43cc2552c24c94b5b0b532759daa60633c11763da5571914af68e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66E3 4996 bytes
font_01_sfnt_off00007802.bin
67cb7162753596a07fce16677f066cc5257dbf78467da5499ad9d0181b15aac4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7802 10128 bytes
font_02_sfnt_off00009ab0.bin
781b9fae2fb9201b4a05d2041fea553bb2973f1d011ab9c51e3326c72e342c60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AB0 4324 bytes

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