Malicious PDF — malware analysis report

Static analysis result for SHA-256 699b9fe55518ad4f…

MALICIOUS

PDF

33.9 KB Created: 2020-08-30 13:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe54892bfda0ae84916ca656d674b8e9 SHA-1: 87c23093ec43bdc9d7326d04a257d98a715d0990 SHA-256: 699b9fe55518ad4ffb6592aa44b72cd4d54426028a10aa28b7612d490bcfe9bf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple critical heuristics for containing a malicious redirector link and a large number of external PDF links, suggesting a link farm or phishing attempt. The primary malicious URL identified is ttraff.cc, which is known to host redirectors. While the document body contains text related to 'relative adverbs worksheet', this appears to be a lure, with the actual malicious intent being the distribution of links.

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/wix?keyword=relative+adverbs+worksheet
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3579/4340/files/akbarnama_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/4519/9777/files/zivuxovule.pdf
    • https://cdn.shopify.com/s/files/1/0434/0695/0557/files/sakawisajefo.pdf
    • https://static.usrfiles.com/ugd/97368a_996d2238284e4a728aa36977a83c4d64.pdf
    • https://static.usrfiles.com/ugd/b8c837_0e48e6ace5ee48cfb4859bc2255ecf25.pdf
    • https://cdn.shopify.com/s/files/1/0439/0905/4619/files/fijiwutepak.pdf
    • https://cdn.shopify.com/s/files/1/0430/3532/8663/files/pabusunubemi.pdf
    • https://cdn.shopify.com/s/files/1/0435/2563/6250/files/contingency_approaches_to_leadership.pdf
    • https://cdn.shopify.com/s/files/1/0434/6331/1512/files/amniote_egg_coloring_answers.pdf
    • https://static.usrfiles.com/ugd/b8bbd7_17b00d0066e44dfd94d90607ad3fd0d6.pdf
    • https://static.usrfiles.com/ugd/b8c837_3192a14a0fbe4f5593de9274581fa9d7.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004646.bin
535e496136a683c487b888052e8c3e852a5ed157328f57e06e1903878503e135
pdf-font-stream PDF embedded font (sfnt) at offset 0x4646 5276 bytes
font_01_sfnt_off00005842.bin
8c9954301db91adefb29d0179731867542116e432929f9fc9f38bf4157e4da27
pdf-font-stream PDF embedded font (sfnt) at offset 0x5842 10216 bytes