Malicious PDF — malware analysis report

Static analysis result for SHA-256 17fa3e8d7158ae66…

MALICIOUS

PDF

55.8 KB Created: 2020-08-09 23:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b8beea3a2ddc96e91075ef52811c9ab SHA-1: 2a2368057b22304ecb63199056169f9acd4b9fef SHA-256: 17fa3e8d7158ae664a08a7155bd4332f2b98173d0ee44e6705fe16500252b0f9
154 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to a link farm designed to redirect users to potentially malicious content, as indicated by the critical PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body itself is heavily obfuscated but contains URLs that are likely part of this redirection scheme. The ML classifier also strongly flagged this PDF as malicious.

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=toward+an+anthropological+theory+of+value+pdf
    • http://files.madisonrosefund.com/uploads/1/3/1/3/131378990/zumovudanipefip_menoruzizir.pdf
    • http://files.authorangelawhite.website/uploads/1/3/2/7/132741556/2b41b.pdf
    • http://files.arthousecafe.com/uploads/1/3/1/0/131070131/50d0779fb.pdf
    • http://files.sustainability-and-social-innovation.com/uploads/1/3/0/7/130740249/1410599.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1497/8718/files/vaferozuwevajonero.pdf
    • https://cdn.shopify.com/s/files/1/0431/5935/5558/files/23950602733.pdf
    • https://cdn.shopify.com/s/files/1/0439/7717/9294/files/67756875107.pdf
    • https://cdn.shopify.com/s/files/1/0432/2004/1886/files/54860192758.pdf
    • https://cdn.shopify.com/s/files/1/0448/5208/4898/files/oil_producing_countries_in_africa.pdf
    • https://cdn.shopify.com/s/files/1/0432/3993/2067/files/58393847959.pdf
    • https://cdn.shopify.com/s/files/1/0435/7075/7791/files/17605073284.pdf
    • https://cdn.shopify.com/s/files/1/0433/4682/1278/files/jirifedegudotop.pdf
    • https://cdn.shopify.com/s/files/1/0427/6423/9014/files/nidadiwiv.pdf
    • https://cdn.shopify.com/s/files/1/0430/3290/3833/files/nezilavapuzofonivudo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0854/0324/files/kojivizozam.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_off00009c9a.bin
1971ba5eb10f16cecdc520352d218d95895230a862c93bd9cc40b947fd7bf289
pdf-font-stream PDF embedded font (sfnt) at offset 0x9C9A 5444 bytes
font_01_sfnt_off0000af3b.bin
fc629f5a9d550d1dbed491f4e86c0913fb80d0ec50edd05dbe6fedd9f60612f6
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF3B 10188 bytes