Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e073945ecd377d5…

MALICIOUS

PDF

46.2 KB Created: 2020-08-10 06:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0223f3d4a3165a6fbaf291ffbb9b3ba1 SHA-1: 118aaedc5123d252189d486926162eb73a2b0506 SHA-256: 3e073945ecd377d5ffb953f96759b2c0a74041f05ac997dddd90183dc3e95e92
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised with a keyword related to crafting. The document body, though heavily obfuscated, also contains this URL and other Shopify links, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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=manualidades+en+madera+paso+a+paso+pdf
    • http://files.achievect.com/uploads/1/3/1/1/131163780/vorakubusi-bafudejopu.pdf
    • http://fubejemom.henfieldthenandnow.net/uploads/1/3/0/8/130813528/5934134.pdf
    • http://files.ibunson.com/uploads/1/3/2/6/132682293/8590363.pdf
    • https://cdn.shopify.com/s/files/1/0427/5997/9174/files/xoxujumezujizete.pdf
    • https://cdn.shopify.com/s/files/1/0439/2825/6680/files/nujomesuwolukotutarininaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/7001/4111/files/kigaja.pdf
    • https://cdn.shopify.com/s/files/1/0433/8617/5651/files/72327890336.pdf
    • https://cdn.shopify.com/s/files/1/0432/4638/7362/files/power_system_analysis_stevenson.pdf
    • https://cdn.shopify.com/s/files/1/0434/6223/0181/files/mibabubive.pdf
    • https://cdn.shopify.com/s/files/1/0430/4257/0402/files/mabupe.pdf
    • https://cdn.shopify.com/s/files/1/0430/8982/1845/files/bosupiku.pdf
    • https://cdn.shopify.com/s/files/1/0448/0519/3885/files/pneumatic_tools_equipments.pdf
    • https://cdn.shopify.com/s/files/1/0429/8774/9529/files/beginning_with_disability_a_primer.pdf
    • https://cdn.shopify.com/s/files/1/0435/6636/6869/files/update_minecraft_server.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dedijadexurusefux.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_off000075c7.bin
4ffa9fafd3fd042414d41b7b45139082e6f4f234f69362fa9b0628004e56210f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75C7 5192 bytes
font_01_sfnt_off00008762.bin
5ce00fc0fefc430d63190a279391bf2765ef17d3d9d5e68a8673642a9d0283a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8762 10828 bytes

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