Malicious PDF — malware analysis report

Static analysis result for SHA-256 543f15caa96e5f09…

MALICIOUS

PDF

49.0 KB Created: 2020-07-30 04:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc8a15d60bfb2a0e4b1c6b5a5618576c SHA-1: 1a58f65af16bfbf89ff5840d8a656dbbcb8d98b8 SHA-256: 543f15caa96e5f09620dd06a28ce98f057382aa780f041688cc27b3530d5b666
152 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector infrastructure at 'ttraff.ru'. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this, indicating the document's primary purpose is to lure users to malicious sites. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be heavily obfuscated or corrupted, preventing a clear understanding of its content beyond the metadata.

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.ru/pify?keyword=diacetyl+in+beer+pdf
    • http://files.wargamemodelsinohio.com/uploads/1/3/1/0/131070940/tizevaxafixa.pdf
    • http://files.claytoncivitan.com/uploads/1/3/1/4/131437982/8574b6ff90cb1f.pdf
    • http://files.deserthempnv.com/uploads/1/3/2/8/132814096/9743002.pdf
    • https://cdn.shopify.com/s/files/1/0431/3622/1341/files/18265467213.pdf
    • https://cdn.shopify.com/s/files/1/0431/1715/0368/files/mukegamidezivoxigisawam.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5704/files/risikolemegeboba.pdf
    • https://cdn.shopify.com/s/files/1/0433/4492/0734/files/guriwuziwu.pdf
    • https://cdn.shopify.com/s/files/1/0428/4570/0262/files/dikukum.pdf
    • https://cdn.shopify.com/s/files/1/0436/2053/2386/files/32169946441.pdf
    • https://cdn.shopify.com/s/files/1/0440/0663/7726/files/senatutanubofusepizesuwof.pdf
    • https://cdn.shopify.com/s/files/1/0438/6455/5680/files/nifinagudezurel.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48054684450.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/17418425376.pdf
    • https://cdn.shopify.com/s/files/1/0431/0876/1764/files/43771628247.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_off00008324.bin
62bb809bde9464860ad230215745ea8a4bdbb72dd6e2a21b11c6539dba741d64
pdf-font-stream PDF embedded font (sfnt) at offset 0x8324 4892 bytes
font_01_sfnt_off000093cd.bin
38f2736708e8c96b045edf5571e7235c50d685b3f0d02154b40e6effbf9b59ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x93CD 10252 bytes