Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f68a79857426c28…

MALICIOUS

PDF

40.5 KB Created: 2020-08-06 18:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f4b65339349a36ddcb0744e5bd5adaa SHA-1: ade8e6d922ee9c3aad0c15f1f95358ac38ae6fb7 SHA-256: 8f68a79857426c28e97fc643a886c1005f71482209ad0d93b126d5cb574ab006
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=certification+of+employment+pdf'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm designed to improve search engine ranking for malicious content. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the payload.

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=certification+of+employment+pdf
    • http://files.tritongymwear.com/uploads/1/3/1/4/131407802/3d85aeb9809.pdf
    • http://wipijinoj.rjcmindworks.com/uploads/1/3/0/7/130776031/wezusi-setorexuwevigef.pdf
    • http://files.suemcphee.nz/uploads/1/3/2/6/132695408/zotopozak_jomuroxetekarub_kasatoz.pdf
    • http://files.bealegacybuilder.com/uploads/1/3/0/7/130775350/1501f.pdf
    • http://files.emilygilldesigns.com/uploads/1/3/1/1/131164386/gikurotevamedok_fotix.pdf
    • https://cdn.shopify.com/s/files/1/0432/6418/0390/files/minecraft_server_status_html.pdf
    • https://cdn.shopify.com/s/files/1/0430/7494/5184/files/voicemeeter_and_discord.pdf
    • https://cdn.shopify.com/s/files/1/0434/7956/4448/files/tinulewoxapopibifapup.pdf
    • https://cdn.shopify.com/s/files/1/0427/7728/0671/files/47855437022.pdf
    • https://cdn.shopify.com/s/files/1/0431/6495/8879/files/drupal_8_form_api.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/82505274200.pdf
    • https://cdn.shopify.com/s/files/1/0431/2078/7613/files/61060445062.pdf
    • https://cdn.shopify.com/s/files/1/0428/6555/7671/files/muwatuxukuwufuvediwomevel.pdf
    • https://cdn.shopify.com/s/files/1/0451/4159/0170/files/activity_coefficient.pdf
    • https://cdn.shopify.com/s/files/1/0434/1838/6588/files/bapimamelumufonatude.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_off00006195.bin
034d0d3b6f0562f41c9d9dd24f774426e0288451cacdcc927137eed795a78f3b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6195 5132 bytes
font_01_sfnt_off000072fd.bin
947842bddb783bfe065f4507d07468653817f8bbd39334f5c723f7613672952b
pdf-font-stream PDF embedded font (sfnt) at offset 0x72FD 10080 bytes