Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d68f27b79029c6…

MALICIOUS

PDF

50.8 KB Created: 2020-09-05 04:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8d71f94e556e1e5e10a3575d1a339f3 SHA-1: 0af8b75cbb32b33525a105f0320badd8669bfd1c SHA-256: 82d68f27b79029c66f8d9300779fcf8ef0e192bb459a246fe4f79991dfd5db85
152 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.link/wix?keyword=angular+7+bootstrap+templates+free'. This link is presented within the document body, disguised as a resource for free Angular templates, aiming to trick users into clicking it. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on cdn.shopify.com, suggesting an attempt to distribute malicious content or engage in SEO poisoning. No scripts were extracted, and the document body is heavily obfuscated, but the primary malicious intent is clear from the redirector link.

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.link/wix?keyword=angular+7+bootstrap+templates+free
    • https://cdn.shopify.com/s/files/1/0430/9424/5537/files/ripamu.pdf
    • https://cdn.shopify.com/s/files/1/0435/4693/5451/files/node_js_base64_decode.pdf
    • https://cdn.shopify.com/s/files/1/0459/2543/3511/files/katajukefuvogamepemu.pdf
    • https://static.usrfiles.com/ugd/f5892c_8894f6bf294f4e2fa0dd4e2b55c41e5b.pdf
    • https://static.usrfiles.com/ugd/b8c837_a292157288c34cb6a8fde7ba316f5abb.pdf
    • https://static.usrfiles.com/ugd/b8c837_adf1e05142ca4a52861a99efe5ed1804.pdf
    • https://cdn.shopify.com/s/files/1/0431/2301/5841/files/after_effects_tutorials_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/0814/8127/files/zedebibarajakexir.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9361/files/luwixokav.pdf
    • https://cdn.shopify.com/s/files/1/0430/9660/4825/files/wifislax_tutorial_english.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_off00008b00.bin
fe2e735522c3e216e257d1c5859e58692eb4d7d40b3d336321c21e286262358c
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B00 5432 bytes
font_01_sfnt_off00009d70.bin
b91fc265531db7c1146c8136ce1f49eb75db85d04104d0b1585a2cc5a151b879
pdf-font-stream PDF embedded font (sfnt) at offset 0x9D70 9896 bytes