Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b9d5e2434be93c…

MALICIOUS

PDF

44.1 KB Created: 2020-08-13 00:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad4cfccfe92e2256fb42079134696499 SHA-1: e29b9189946f06d6cdc970c9710d48c48c13bd0d SHA-256: f4b9d5e2434be93c04426f087468af2748b6cb82680a119a5b65abefdee56199
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one prominent link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'children's bible study lessons' and the URL for the malicious redirector, suggesting a lure. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic firing confirms the malicious nature of the embedded link.

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=children+s+bible+study+lessons+pdf
    • http://files.mywytchyways.com/uploads/1/3/2/7/132712214/rolamelowomokuzikuf.pdf
    • http://files.geekburning.com/uploads/1/3/0/8/130874142/134690.pdf
    • http://files.dakotawilliamsgamedesign.com/uploads/1/3/1/4/131408928/2048926.pdf
    • http://files.plainbird.org/uploads/1/3/1/0/131069934/vuvuf-giwamojisivibeg-moxoxa.pdf
    • https://cdn.shopify.com/s/files/1/0429/5881/5398/files/arsenico_en_el_agua.pdf
    • https://cdn.shopify.com/s/files/1/0427/7541/2902/files/jugupudolifamalixovevone.pdf
    • https://cdn.shopify.com/s/files/1/0437/6572/7383/files/lei_9610_direitos_autorais.pdf
    • https://cdn.shopify.com/s/files/1/0438/0337/7824/files/kukuranuxo.pdf
    • https://cdn.shopify.com/s/files/1/0434/9480/1568/files/dasatemez.pdf
    • https://cdn.shopify.com/s/files/1/0431/2068/9306/files/vaxonalulojureme.pdf
    • https://cdn.shopify.com/s/files/1/0433/0166/6969/files/becker_muscular_dystrophy.pdf
    • https://cdn.shopify.com/s/files/1/0438/4695/9261/files/fivad.pdf
    • https://cdn.shopify.com/s/files/1/0430/9801/3845/files/55946479205.pdf
    • https://cdn.shopify.com/s/files/1/0433/9751/3381/files/2139765817.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71895612735.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_off00006f0c.bin
2429c154920f81b258de2f08974200cb581fb2e5645c7bd9d93ec5367f06e475		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F0C 5068 bytes
font_01_sfnt_off0000803a.bin
94475f500031dde392244334656dead51a8ccf4c2c6e2e6c47f30723b70d5273		 pdf-font-stream PDF embedded font (sfnt) at offset 0x803A 10316 bytes

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