Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bfbdcc5ce327155…

MALICIOUS

PDF

43.7 KB Created: 2020-08-02 23:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10142bcf7a5c88432cadf48100db3b51 SHA-1: aabde5368460bdda3f8da029a8009c890300115d SHA-256: 6bfbdcc5ce32715592502643e394ee63cf0d2135bdff5e5b95b22c5b552f7b5a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and a URL that likely serves as a lure or initial point of contact for a phishing or malware distribution campaign.

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=execute+disable+bit
    • http://files.cfcedinburgh.com/uploads/1/3/1/8/131871698/xuvenogapu.pdf
    • http://files.sophialove.org/uploads/1/3/0/8/130814127/nugikof.pdf
    • http://files.ssvcc.com/uploads/1/3/0/7/130775092/46dec6a2018778e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/6103/5686/files/nifamibi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7899/1518/files/44799811053.pdf
    • https://cdn.shopify.com/s/files/1/0432/0490/3073/files/61440788105.pdf
    • https://cdn.shopify.com/s/files/1/0434/3191/9765/files/jujodapujogabi.pdf
    • https://cdn.shopify.com/s/files/1/0430/0800/0163/files/15871674555.pdf
    • https://cdn.shopify.com/s/files/1/0431/3799/0813/files/wuvefufomi.pdf
    • https://cdn.shopify.com/s/files/1/0435/1796/8543/files/zatorobuvide.pdf
    • https://cdn.shopify.com/s/files/1/0433/0999/0043/files/busimuvufudobog.pdf
    • https://cdn.shopify.com/s/files/1/0429/5848/7703/files/18543525412.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_off00006ed8.bin
3b9b5f632c4c87fbd804fcaf54845730b4ee51174219ff14f3c7b29fe95a26ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED8 5000 bytes
font_01_sfnt_off00007fef.bin
bb1b98ef928ab2dca2c66d805eb02a501ecd6a0d64ff0539657b70c76ce42c83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FEF 10196 bytes

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