Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d2cb8b7d563ce98…

MALICIOUS

PDF

53.6 KB Created: 2020-08-05 14:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: baae252444b4d1a422a3f9c38c03443c SHA-1: 1cb5a3b17d42568aaa6ae414932c7e2ee61a0507 SHA-256: 7d2cb8b7d563ce9811270eebf4618113aceee255b41d84ae92aeebc386ebdcef
150 Risk Score

Malware Insights

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

The PDF contains numerous links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the target URL. The presence of a link farm and the ML classifier firing strongly indicate malicious intent. The primary attack pattern involves tricking the user into clicking a link that leads to malicious infrastructure.

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.cc/pify?keyword=b+arch+paper+2020+pdf
    • http://files.mygrmobilervrepair.com/uploads/1/3/2/3/132303378/6724207.pdf
    • http://files.chulavistachamber.org/uploads/1/3/2/7/132740606/3852d.pdf
    • http://files.mpbcroanoke.com/uploads/1/3/2/6/132680808/sijolaz_muwekibisi.pdf
    • https://cdn.shopify.com/s/files/1/0437/1238/1079/files/gilgo_beach_cam.pdf
    • https://cdn.shopify.com/s/files/1/0432/7319/1588/files/43644593061.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/lejetor.pdf
    • https://cdn.shopify.com/s/files/1/0432/0631/2093/files/guru_charitra_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0437/9390/7869/files/2678875421.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/77363931764.pdf
    • https://cdn.shopify.com/s/files/1/0433/7660/7390/files/foe_reaper_4000.pdf
    • https://cdn.shopify.com/s/files/1/0437/8676/4446/files/wadeganax.pdf
    • https://cdn.shopify.com/s/files/1/0429/8987/9445/files/42281485501.pdf
    • https://cdn.shopify.com/s/files/1/0434/5944/4889/files/catalogo_boticario_baixar.pdf
    • https://cdn.shopify.com/s/files/1/0428/5064/8223/files/bilixafozirisulog.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_off0000887a.bin
2e033a54e2b4cb666a1db8a6d668d6915e6b1fbc7b9a0ae2198df78d50b47cf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x887A 5356 bytes
font_01_sfnt_off00009ab2.bin
a674a47e2d490435ea90dca13ac06c31767cfa0a81eed12f38ce77373d8f669e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AB2 15196 bytes

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