Malicious PDF — malware analysis report

Static analysis result for SHA-256 be1619edad04a2cd…

MALICIOUS

PDF

48.0 KB Created: 2020-07-24 04:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a9c542975c1f403c6c6390fe5a62d7e SHA-1: e65880436f9faf392e6714335b84aeacffc60cbc SHA-256: be1619edad04a2cd26af93fc4ee81a510d51622d55f05dc57c3a598f4fa1fac3
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a high number of embedded links, including one pointing to a known malicious redirector. The document body is heavily obfuscated, but the presence of numerous links suggests a phishing or malware distribution attempt. The primary attack vector appears to be a link farm designed to lure users to external sites.

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=clamato+picante+nutrition+information
    • http://files.hansenmath.org/uploads/1/3/1/1/131164476/08b53238dd565.pdf
    • http://files.rebeccalybrand.com/uploads/1/3/1/4/131407423/4467089.pdf
    • http://files.scottishfamilytale1650-1950.com/uploads/1/3/2/6/132681343/22d66.pdf
    • https://cdn.shopify.com/s/files/1/0436/2049/9616/files/gotofagakonisoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/3164/9689/files/28559328828.pdf
    • https://cdn.shopify.com/s/files/1/0430/4479/8613/files/88027025482.pdf
    • https://cdn.shopify.com/s/files/1/0434/0213/3656/files/76301109324.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wunize.pdf
    • https://cdn.shopify.com/s/files/1/0433/6631/8230/files/xedikofukajisimila.pdf
    • https://cdn.shopify.com/s/files/1/0430/9752/2329/files/82316264273.pdf
    • https://cdn.shopify.com/s/files/1/0431/6132/1634/files/38948222172.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7746/files/bejizasukoraluwixulebej.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_off000071f9.bin
7d3c235d8c87fc42ae0fa89ea4b74ae7919fb93f4a059d61c9c7e1b0dfd8eded		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71F9 4888 bytes
font_01_sfnt_off00008284.bin
731d0fc4a26475e759e41282812d7949b7453286b0eacdc504be332ae9b89201		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8284 15592 bytes

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