Malicious PDF — malware analysis report

Static analysis result for SHA-256 741b3ec615e768c9…

MALICIOUS

PDF

44.8 KB Created: 2020-08-21 13:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af16c2e375e4187863c75bec38ef5526 SHA-1: a999c8239825c6f6860abb7bd484a25c4e0ff136 SHA-256: 741b3ec615e768c93764a1dc4a9024434301c69825cfe5468303cde13446a996
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm and a redirector link pointing to malicious infrastructure, indicating an attempt to lead users to harmful content. The document body, though heavily obfuscated, contains the same redirector URL. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious redirection.

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/pify?keyword=egyptian+cotton+sheet+set+review
    • http://files.wycombeparanormal.com/uploads/1/3/0/8/130814106/janujog-gajijarexo.pdf
    • http://vadiro.heartlandpools.com/uploads/1/3/1/1/131164250/damilun-xifopifozojibaj-digewuponikono-wagok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/8737/1171/files/9637260930.pdf
    • https://cdn.shopify.com/s/files/1/0434/0806/4677/files/2064725130.pdf
    • https://cdn.shopify.com/s/files/1/0448/3075/2930/files/chrome_setup_for_pc_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/0817/8850/files/tegiji.pdf
    • https://cdn.shopify.com/s/files/1/0432/2476/0488/files/17234881530.pdf
    • https://cdn.shopify.com/s/files/1/0430/0508/3811/files/kaplan_series_6.pdf
    • https://cdn.shopify.com/s/files/1/0440/8436/3416/files/minecraft_forge_mac.pdf
    • https://cdn.shopify.com/s/files/1/0432/7089/7824/files/adsorption_chromatography_notes.pdf
    • https://cdn.shopify.com/s/files/1/0428/8380/9443/files/dnd_5e_help_action.pdf
    • https://cdn.shopify.com/s/files/1/0431/2137/7434/files/19002739667.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_off00006f89.bin
7fc3d06f3b06f8fe2e62cda7b0f770cc06c05b738b518da40a5afb7379553308
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F89 5376 bytes
font_01_sfnt_off000081eb.bin
00e9a9ce7398228908de5c3e3807116c06c68bb4dd697352401d588898deb288
pdf-font-stream PDF embedded font (sfnt) at offset 0x81EB 10660 bytes