Malicious PDF — malware analysis report

Static analysis result for SHA-256 7189d8eb5a0a4855…

MALICIOUS

PDF

48.2 KB Created: 2020-08-07 15:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7011b32cd8f2a599ff16838441fa80b SHA-1: 89392663d1c3170dbcb34a1aef0df117dd80e1b0 SHA-256: 7189d8eb5a0a4855987be2ad437f2fcde8234b95017434433a25ff9949f1182b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external resources, suggesting a link farm or a mechanism for distributing further malicious content. One critical heuristic identified a link to known malicious redirector infrastructure at `https://ttraff.com/pify?keyword=features+of+athenian+democracy+pdf`. The document body, though heavily obfuscated, contains references to 'athenian democracy pdf' and the authoring application 'wkhtmltopdf', indicating a lure to disguise the malicious intent. The ML classifier also strongly flagged this PDF as malicious.

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=features+of+athenian+democracy+pdf
    • http://wokiti.hunterwrestling.com/uploads/1/3/0/8/130874359/xozojuzaz.pdf
    • http://files.cheriegrist.com/uploads/1/3/1/0/131070212/1e7b0b02fd826.pdf
    • http://lufoti.harbottleaudio.com/uploads/1/3/2/7/132712207/84a684c779f.pdf
    • http://files.jeffreybirdjr.com/uploads/1/3/0/7/130739951/0a02eed56f3d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5252/3929/files/76651913707.pdf
    • https://cdn.shopify.com/s/files/1/0437/2873/2314/files/21546029586.pdf
    • https://cdn.shopify.com/s/files/1/0432/6424/5925/files/nulokekidemi.pdf
    • https://cdn.shopify.com/s/files/1/0430/2825/0781/files/64276060103.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5523/files/xivodobozinuxebibidodev.pdf
    • https://cdn.shopify.com/s/files/1/0433/6753/0655/files/fijoxatimudez.pdf
    • https://cdn.shopify.com/s/files/1/0431/2114/8061/files/minixikelabimixo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7746/8311/files/69906571807.pdf
    • https://cdn.shopify.com/s/files/1/0427/7259/4844/files/davixoligiwonosenu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6784/2455/files/child_centered_approach_definition.pdf
    • https://cdn.shopify.com/s/files/1/0432/1165/3282/files/51258619839.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_off00007ee2.bin
d09dd1f53d78caf581bccfabf6829e5542427e5fe37cef75a9c9c984788e72b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EE2 5420 bytes
font_01_sfnt_off00009133.bin
b1a450bb0825090674e4b122c098a37dacde434c762b0cd1a15608c6dda5d5b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9133 10060 bytes

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