Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef1098424942bdd…

MALICIOUS

PDF

42.0 KB Created: 2020-08-03 15:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 045fc73b124c90aa7a6b6e2c41f44d75 SHA-1: 554e162426858ffdf2bbd0b0e451981986288489 SHA-256: 4ef1098424942bdd24b619b0311e5733270caf927b9b249a51f69095b86ab60c
150 Risk Score

Malware Insights

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

The PDF contains a high density of embedded URLs, many pointing to external PDF files, characteristic of a link farm designed for SEO manipulation or traffic redirection. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=similar+triangles+worksheet+answers+pdf'. The document body, though heavily obfuscated, contains this same URL, suggesting the primary intent is to drive users to click this malicious link. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=similar+triangles+worksheet+answers+pdf
    • http://files.abocomix.com/uploads/1/3/1/4/131453215/4454693.pdf
    • http://megoti.producedepot.shop/uploads/1/3/2/3/132303189/tupexaxabinolofab.pdf
    • http://files.crediblecompanies.com/uploads/1/3/0/7/130776060/tilej.pdf
    • http://files.valeriedubuc.net/uploads/1/3/0/7/130738753/4258288.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/4780083199.pdf
    • https://cdn.shopify.com/s/files/1/0431/2160/6820/files/71494090229.pdf
    • https://cdn.shopify.com/s/files/1/0435/6187/7665/files/78021765765.pdf
    • https://cdn.shopify.com/s/files/1/0433/8758/4675/files/kovowumuwox.pdf
    • https://cdn.shopify.com/s/files/1/0432/2187/6899/files/48190325006.pdf
    • https://cdn.shopify.com/s/files/1/0430/6557/3537/files/45423328302.pdf
    • https://cdn.shopify.com/s/files/1/0433/4164/3941/files/bakimifadenexejidid.pdf
    • https://cdn.shopify.com/s/files/1/0432/2017/2957/files/sql_joins_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0440/8049/6792/files/pulomelovijepiwazukaluna.pdf
    • https://cdn.shopify.com/s/files/1/0438/3699/7792/files/vancouver_wa_weather_radar.pdf
    • https://cdn.shopify.com/s/files/1/0432/7201/1941/files/falanit.pdf
    • https://cdn.shopify.com/s/files/1/0431/9579/3571/files/dezuvenakajitabegalezed.pdf
    • https://cdn.shopify.com/s/files/1/0433/0225/6795/files/leed_green_associate_practice_exams.pdf
    • https://cdn.shopify.com/s/files/1/0434/3873/5527/files/square_root_in_python.pdf
    • https://cdn.shopify.com/s/files/1/0427/5588/3175/files/risewazumisow.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_off00006527.bin
7cd4da9632daa0f70b92da8a6c695d201ac0297f761dc3c2a57907e257d3b64e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6527 5716 bytes
font_01_sfnt_off0000787e.bin
ddfd031b0983f3a731b181c3b6efb0f26c4d7cb60f7f07785c0c3441b472cd3f
pdf-font-stream PDF embedded font (sfnt) at offset 0x787E 10072 bytes