Malicious PDF — malware analysis report

Static analysis result for SHA-256 0977075cf139f0c4…

MALICIOUS

PDF

45.5 KB Created: 2020-08-24 02:41:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed608e64ad383f2d2dd7cd2f9e3028f9 SHA-1: bd34e911a28ab520bd0b6fe8c129f98845c9ffde SHA-256: 0977075cf139f0c41af7b55e03e0720f9701d3f90ad889b37f3abf737f63f434
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the same redirector URL, suggesting an attempt to trick users into visiting a malicious site. The ML classifier also strongly indicated maliciousness.

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=stormie+omartian+libros+pdf
    • http://gebupiwe.nvnatalie.com/uploads/1/3/1/6/131606968/fawezara.pdf
    • http://files.lorokawirehairedvizslas.com/uploads/1/3/0/8/130815017/1165479.pdf
    • http://files.chipperchadbourne.com/uploads/1/3/0/8/130813317/tewabus-gikiwasigadozu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1010/5255/files/alice_in_chains_dirt_songbook.pdf
    • https://cdn.shopify.com/s/files/1/0429/3846/6467/files/rimani.pdf
    • https://cdn.shopify.com/s/files/1/0429/3401/0015/files/poluze.pdf
    • https://cdn.shopify.com/s/files/1/0427/8291/6767/files/apowermirror_for_windows_7_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/8962/5241/files/undang_undang_dasar_1945_amandemen_ke_4.pdf
    • https://cdn.shopify.com/s/files/1/0433/9525/2374/files/81252845147.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/taridulozomoxekolakinuku.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_off000073e8.bin
3ff35471e08e7c24490df9fba30e77664b599bc6c2dca8f0607f60c730f555c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73E8 5428 bytes
font_01_sfnt_off0000862f.bin
b11c8ce90550245f99392690a09ad75a61a31ad4f9af33fa14c06f0177cbfb65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x862F 10260 bytes

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