Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff59ed1060dbc4f3…

MALICIOUS

PDF

35.8 KB Created: 2020-08-05 07:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f48baedae48d3eb5ff925f83cbc980f SHA-1: 3ed93a617d0bb18a951934ca70a799a8c120e9f8 SHA-256: ff59ed1060dbc4f31a3667218eb43540807cf61a0ce53dc2acbf41ac7fdde888
152 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to a known malicious redirector. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/wb?keyword=10%20social%20science%20pdf%20in%20kannada, which is likely used to lure victims. The file also exhibits characteristics of a link farm, with numerous embedded URLs pointing to various PDF files, likely for SEO manipulation or to host further 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/wb?keyword=10%20social%20science%20pdf%20in%20kannada
    • http://mojew.michaelschunke.com/uploads/1/3/1/4/131406149/bexefi.pdf
    • http://files.radomirtodorov.com/uploads/1/3/1/8/131857758/sapasutexisuzig.pdf
    • http://files.killesterspecialolympics.com/uploads/1/3/2/6/132695734/ratatuke.pdf
    • https://cdn.shopify.com/s/files/1/0430/7173/3917/files/18759581487.pdf
    • https://cdn.shopify.com/s/files/1/0431/7777/1164/files/549906331.pdf
    • https://cdn.shopify.com/s/files/1/0429/9282/8579/files/jemejazedusuramopuge.pdf
    • https://cdn.shopify.com/s/files/1/0429/9125/5713/files/81754112355.pdf
    • https://cdn.shopify.com/s/files/1/0429/9862/8501/files/devix.pdf
    • https://cdn.shopify.com/s/files/1/0431/5827/4205/files/99444850794.pdf
    • https://cdn.shopify.com/s/files/1/0434/8071/1325/files/39479099254.pdf
    • https://cdn.shopify.com/s/files/1/0438/0108/4064/files/blue_book_of_english_grammar.pdf
    • https://cdn.shopify.com/s/files/1/0436/0231/3373/files/bekamelimevometi.pdf
    • https://cdn.shopify.com/s/files/1/0430/1075/2663/files/nerawe.pdf
    • https://cdn.shopify.com/s/files/1/0429/9938/2170/files/java_7_download_32_bit.pdf
    • https://cdn.shopify.com/s/files/1/0434/3323/0488/files/zeus_gta_v_mod_menu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/50661704922.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_off00004e95.bin
c852688ba93ea0d8078cdae0729f68b44bcc473c0cc83e01db65ffa4d1b414c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x4E95 5216 bytes
font_01_sfnt_off00006070.bin
fdc64427009c67e740bc422c186075fd888fd7c2e85e12093b5cbf3841084124
pdf-font-stream PDF embedded font (sfnt) at offset 0x6070 10012 bytes