Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cc673f85b7fffc0…

MALICIOUS

PDF

44.6 KB Created: 2020-07-26 11:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d6bb9a713af564441b7500e8f549ef6 SHA-1: a587c160c8ec820715682ff678e3db08af0a467b SHA-256: 7cc673f85b7fffc012c5f7c0dedc46525e12bf2f39f93d1871e4b4dcb76021c8
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and contains numerous embedded links, with one specifically pointing to a known malicious redirector. The presence of a link farm suggests an attempt to distribute malicious content or phish users. The document body, though heavily obfuscated, contains metadata related to PDF generation, indicating it's likely a lure document.

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.com/pify?keyword=sectional+aeronautical+chart+legend+pdf
    • http://files.cerialephotography.com/uploads/1/3/2/6/132681670/kumeze_sivesedubagimir_kumifesakadogu.pdf
    • http://files.bradleypackets.com/uploads/1/3/1/4/131407823/basajikat_gurarut_buzuf_tapafosuzegu.pdf
    • http://files.mycorporatecounselor.com/uploads/1/3/2/6/132681951/koniramogil-dizofudab-vopoje-pofop.pdf
    • http://files.thenestbg.com/uploads/1/3/0/7/130775676/2095838.pdf
    • http://files.cerialephotography.com/upload
    • https://cdn.shopify.com/s/files/1/0428/6844/1254/files/69437377431.pdf
    • https://cdn.shopify.com/s/files/1/0430/1042/4993/files/lasinodufewivonuzimomeb.pdf
    • https://cdn.shopify.com/s/files/1/0433/2670/1723/files/saluzadumavelajifavo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0928/6050/files/13214642328.pdf
    • https://cdn.shopify.com/s/files/1/0430/0174/1463/files/xexazivotalezikuwezo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2826/6654/files/dijuzigusuborutotomurewu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5376/9126/files/52893060446.pdf
    • https://cdn.shopify.com/s/files/1/0432/7905/7056/files/60354717169.pdf
    • https://cdn.shopify.com/s/files/1/0428/7594/5126/files/44266245621.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2622/files/46326059599.pdf
    • https://cdn.shopify.com/s/files/1/0433/4472/4133/files/sidademuzudurid.pdf
    • https://cdn.shopify.com/s/files/1/0432/4527/3251/files/17224283252.pdf
    • https://cdn.shopify.com/s/files/1/0428/0903/2863/files/99239364255.pdf
    • https://cdn.shopify.com/s/files/1/0440/9671/6952/files/47709049849.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_off0000718b.bin
45834bee715b6645873fe6ec985d1f1957f078714ec2bec724f6b93e05c00dd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x718B 5224 bytes
font_01_sfnt_off00008335.bin
37a29217e01a143e29872b9b686d4ded7a5d563ddfefde5ce16148a96fa254ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8335 9908 bytes

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