Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ad1124d9fbbdee…

MALICIOUS

PDF

52.8 KB Created: 2020-08-21 15:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfa8c8284568f871f8f051ef53fb497f SHA-1: 93540920be5d34ddc4a68c21d8e510b0681d194b SHA-256: 38ad1124d9fbbdee3fe1e67872c8d4aad74537264e8528d48a5ca44573cc02d1
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or redirection strategy. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely the primary malicious payload delivery mechanism. The document body contains a movie title, likely a lure, and the PDF was generated by wkhtmltopdf, a tool often used to create documents for SEO manipulation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=bol+radha+bol+movie
    • http://zalaf.paulaspatisseries.com/uploads/1/3/2/7/132740214/demamabi-xumunesapadukuz.pdf
    • http://files.livredematieres.com/uploads/1/3/1/4/131452883/jafizabomokevabafaka.pdf
    • http://bimure.cuttingedgepoodles.com/uploads/1/3/1/4/131483337/xuwapil.pdf
    • https://cdn.shopify.com/s/files/1/0431/6292/7263/files/stihl_ms_250_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/7573/1616/files/zosegiwutigavafuxu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8119/5927/files/santa_biblia_reina_valera.pdf
    • https://cdn.shopify.com/s/files/1/0432/6942/3269/files/44749979063.pdf
    • https://cdn.shopify.com/s/files/1/0431/6931/7013/files/62694324201.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/temos.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87678197609.pdf
    • https://cdn.shopify.com/s/files/1/0431/7508/4193/files/navibasekekijoririku.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fatexuxutul.pdf
    • https://cdn.shopify.com/s/files/1/0428/1332/5471/files/64662705821.pdf
    • https://cdn.shopify.com/s/files/1/0429/2640/7833/files/ritz_carlton_employee_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0439/0833/3736/files/tosidefipajevuf.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060ed.bin
750d1396ea0bf5fbbfb1efa7800930e25a2e400cebbc542b316d66b1e2c172b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60ED 3120 bytes
font_01_sfnt_off00006c22.bin
f26168d159166f87bad1cdedad1e59d44b8471a66b86dca1836dd4c6e6b947b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C22 4740 bytes
font_02_sfnt_off00007c31.bin
67ea9d4521a607cfeb478d1b6b4a278f90ad23ad5bd60c387574dfe7c8e6d913		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C31 16072 bytes
font_03_sfnt_off0000ab25.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB25 4324 bytes
font_04_sfnt_off0000b926.bin
cace4a91d79b067ed1f40758740bbac43a506aec87bf5ef1d5944cfad013b27d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB926 2572 bytes

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