Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b720620624635e9…

MALICIOUS

PDF

46.2 KB Created: 2020-08-23 21:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00027f1c276744c1ab8e7e603ab917c5 SHA-1: da3a81c3f55d8674a7119a939a350db7a6c75dce SHA-256: 1b720620624635e91552402be8680817c0eceb4035a2bf010c47fabbbc5da34b
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=ice+cream+cone+coloring+sheets'. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The PDF also exhibits characteristics of a link farm, with numerous external links, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, and the PDF structure itself is the primary vector for the malicious redirection.

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=ice+cream+cone+coloring+sheets
    • http://tafise.storywings.net/uploads/1/3/1/3/131383651/wuxukujoxa.pdf
    • http://files.ir-architecture.com/uploads/1/3/1/8/131857315/1652306.pdf
    • https://cdn.shopify.com/s/files/1/0428/1358/7623/files/6092494739.pdf
    • https://cdn.shopify.com/s/files/1/0432/6303/3502/files/tuvaferitarasurotamowijaw.pdf
    • https://cdn.shopify.com/s/files/1/0429/3758/1734/files/marketing_strategy_examples.pdf
    • https://cdn.shopify.com/s/files/1/0433/8640/5029/files/chrome_os_virtualbox_2018.pdf
    • https://cdn.shopify.com/s/files/1/0428/2076/3804/files/gosaxopoda.pdf
    • https://cdn.shopify.com/s/files/1/0429/7788/6367/files/guzebopuwixowej.pdf
    • https://cdn.shopify.com/s/files/1/0431/4424/9499/files/biblical_hebrew_grammar_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/7640/2854/files/91076580735.pdf
    • https://cdn.shopify.com/s/files/1/0432/7201/1931/files/coloured_wrapping_paper_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0435/3579/4340/files/akbarnama_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/1402/8450/files/charcoal_briquette_making.pdf
    • https://cdn.shopify.com/s/files/1/0427/5588/3175/files/2020_ashrae_handbook_fundamentals_si_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/0697/5382/files/pazekutuxojobape.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/
    • https://cdn.shopify.com/s/files/1/0428/13

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007837.bin
b51bd412852eb32b4197589fce212f624c7de32bc1329ff381810b38b5fab920
pdf-font-stream PDF embedded font (sfnt) at offset 0x7837 5152 bytes
font_01_sfnt_off00008981.bin
64f0621822eb71b5dc98e83b7dd91d3b195f30af6da6ca0e838f3af6bdb3adae
pdf-font-stream PDF embedded font (sfnt) at offset 0x8981 10044 bytes