Malicious PDF — malware analysis report

Static analysis result for SHA-256 65bf9da280b57256…

MALICIOUS

PDF

50.1 KB Created: 2020-08-07 15:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6221a42b4cb4517d1b79012d7b59c1b5 SHA-1: f95afea97b2f537259b860a4d1c79f0e0993c3d3 SHA-256: 65bf9da280b57256cc4c3537df7a14aadc87f68dcd69b52db7b89d62c9b942ee
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically a URL designed to deliver a payload. The document body, though heavily obfuscated, contains the same malicious URL and text related to a student visa attestation, suggesting a phishing lure. The presence of numerous external PDF links, many hosted on Shopify, further indicates a link farm designed to distribute malicious content.

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.cc/pify?keyword=attestation+de+prise+en+charge+visa+%25C3%25A9tudiant+pdf
    • http://files.issaquahteencafe.org/uploads/1/3/0/9/130969211/552252.pdf
    • http://xujubofab.mail.venltransport.nl/uploads/1/3/1/8/131856158/b2967a2a92e70eb.pdf
    • http://files.mrsambermoore.com/uploads/1/3/1/3/131383377/vomasewagosukup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/3137/8590/files/43599223437.pdf
    • https://cdn.shopify.com/s/files/1/0437/5547/1002/files/8277096272.pdf
    • https://cdn.shopify.com/s/files/1/0427/8625/9100/files/nujos.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kusamusa.pdf
    • https://cdn.shopify.com/s/files/1/0434/6249/2310/files/44825044934.pdf
    • https://cdn.shopify.com/s/files/1/0439/3464/6440/files/42081513914.pdf
    • https://cdn.shopify.com/s/files/1/0432/5765/9560/files/numpy_split_array_into_chunks.pdf
    • https://cdn.shopify.com/s/files/1/0432/9357/3284/files/83508191168.pdf
    • https://cdn.shopify.com/s/files/1/0435/9107/3947/files/89392664666.pdf
    • https://cdn.shopify.com/s/files/1/0445/4989/8399/files/vehicle_safety_inspection_form.pdf
    • https://cdn.shopify.com/s/files/1/0435/8209/5519/files/siwigajewugukobul.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_off00008061.bin
c8c61446ba0724822ff8cf69584f39427068458c919bf65f05e8bee9efbe2cc0
pdf-font-stream PDF embedded font (sfnt) at offset 0x8061 5576 bytes
font_01_sfnt_off0000931e.bin
245999a1960e0baba5723ad9f1b766afc7082848e3b35b3071e7c13102c227c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x931E 12052 bytes