Malicious PDF — malware analysis report

Static analysis result for SHA-256 f64e32ad53f8395c…

MALICIOUS

PDF

33.0 KB Created: 2020-08-18 14:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef94becffeb31777266d165e7a1c3057 SHA-1: 9f6f899c7abc85d00d974e2c795f6f248817c6a1 SHA-256: f64e32ad53f8395cdb00169dff44d0fd0c9201215f2505223d143158c710b8d4
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The embedded URL `https://ttraff.cc/pify?keyword=handwriting+worksheets+year+5+australia` is a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the same URLs, suggesting a coordinated effort to drive traffic to potentially harmful sites.

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=handwriting+worksheets+year+5+australia
    • http://tipozene.montanaaussiedoodles.com/uploads/1/3/2/7/132710712/wewiwaneritupi.pdf
    • https://cdn.shopify.com/s/files/1/0439/2812/5595/files/63515879805.pdf
    • https://cdn.shopify.com/s/files/1/0437/4275/7029/files/anbe_sivam_tamil_movie_hd_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/2282/7165/files/32447825161.pdf
    • https://cdn.shopify.com/s/files/1/0428/9868/6111/files/70643215014.pdf
    • https://cdn.shopify.com/s/files/1/0431/2976/6039/files/xejazuliwudaraviw.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3809/files/gizifu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3242/0264/files/57199930119.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/76957488457.pdf
    • https://cdn.shopify.com/s/files/1/0432/6113/2968/files/nefikadisoto.pdf
    • https://cdn.shopify.com/s/files/1/0432/8646/2628/files/states_of_matter_quiz_grade_3.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000450b.bin
b41da5ce3732094b72dc7e547c909d388e49a224540caa7075fcd43e5f42bcc9
pdf-font-stream PDF embedded font (sfnt) at offset 0x450B 5428 bytes
font_01_sfnt_off0000578e.bin
975fa45b471ebe71d91de2a6599daad3a4caaff996045f6f7688936b57df23e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x578E 9284 bytes