Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d4b49c139979f2…

MALICIOUS

PDF

51.3 KB Created: 2020-08-07 14:39:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c345b583f5e8ed2422bcc6c98255304a SHA-1: 9737f566434f023006cb26a2edfbddfcf3069db1 SHA-256: b7d4b49c139979f2b9ef08a00bf8a9bfbd033b85de87697a3b3211817b1dbacd
150 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as legitimate content, but the primary URL redirects to known malicious infrastructure. The ML classifier strongly supports maliciousness. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure for free patterns, likely to entice clicks on the redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=free+chain+maille+patterns+pdf
    • http://files.swegas.com/uploads/1/3/1/3/131380583/gipegomaxuriberawun.pdf
    • http://files.middlesexmotorcycle.com/uploads/1/3/2/6/132695576/wunesiveselavisaza.pdf
    • http://files.unitydenton.org/uploads/1/3/1/8/131872055/tonexekavivises.pdf
    • https://cdn.shopify.com/s/files/1/0435/3120/6808/files/vefodixivudakafenozezam.pdf
    • https://cdn.shopify.com/s/files/1/0432/5870/8118/files/tupiselaro.pdf
    • https://cdn.shopify.com/s/files/1/0433/8624/1187/files/62622015133.pdf
    • https://cdn.shopify.com/s/files/1/0434/1019/4582/files/autocad_2020_tutorial_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/2940/4567/files/kiwafaku.pdf
    • https://cdn.shopify.com/s/files/1/0430/0718/0954/files/46511397736.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/92904811518.pdf
    • https://cdn.shopify.com/s/files/1/0429/5730/8063/files/juxezusoforovo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6826/8456/files/sazigurubakujekevipos.pdf
    • https://cdn.shopify.com/s/files/1/0429/3722/1276/files/96141664414.pdf
    • https://cdn.shopify.com/s/files/1/0430/1992/7713/files/mecp_basic_installation_technician_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/4750/8385/files/hormones_in_human_body_and_their_functions.pdf
    • https://cdn.shopify.com/s/files/1/0431/7826/2689/files/dafevolajemuj.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_off00008c02.bin
389cb70bff9bc3e27dd9083117c0b59dd81f64006188bffd5030e4a8da8592a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C02 5352 bytes
font_01_sfnt_off00009e0d.bin
fc6f0861fe6d1ab85a1f5cba8f55ed6e857561a9c0ac334b1e07447ee9cc9a1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E0D 10120 bytes

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