Malicious PDF — malware analysis report

Static analysis result for SHA-256 efafb70a0259b23a…

MALICIOUS

PDF

47.4 KB Created: 2020-08-11 23:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b61c2a2745cb87ea956f160be66bebf8 SHA-1: c54b82b00ddca9071d46810d5df84aeb418c0ef4 SHA-256: efafb70a0259b23af93845a2abf6692dfe7d42cf0d988cbfb58fb5016d5c8ea9
150 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to what appears to be a link farm designed to host SEO-optimized PDFs. One of the primary links directs to a known malicious redirector, ttraff.ru, which is likely intended to lead the user to a malicious site. The ML classifier strongly supports the malicious nature of this PDF. The document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic.

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=difference+between+bibliography+and+reference+pdf
    • http://files.jenferdinandsen.com/uploads/1/3/1/3/131398076/8069861577035.pdf
    • http://files.hope2farmers.org/uploads/1/3/1/4/131482953/ketelojomajipo.pdf
    • http://files.jorgehuertaphotography.com/uploads/1/3/1/4/131438708/2357350.pdf
    • https://cdn.shopify.com/s/files/1/0427/8878/2236/files/39973609210.pdf
    • https://cdn.shopify.com/s/files/1/0437/8663/3374/files/woxinurakanekelefunog.pdf
    • https://cdn.shopify.com/s/files/1/0430/3034/7938/files/943_frases_basicas_en_ingles.pdf
    • https://cdn.shopify.com/s/files/1/0447/9369/2326/files/lotojamav.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tebagomi.pdf
    • https://cdn.shopify.com/s/files/1/0438/6599/7472/files/87913015640.pdf
    • https://cdn.shopify.com/s/files/1/0440/1646/8133/files/95344217639.pdf
    • https://cdn.shopify.com/s/files/1/0429/9731/7785/files/alimentation_bb_6_mois.pdf
    • https://cdn.shopify.com/s/files/1/0433/0727/0297/files/einstein_bagels_nutrition.pdf
    • https://cdn.shopify.com/s/files/1/0432/1270/1854/files/domanusosexit.pdf
    • https://cdn.shopify.com/s/files/1/0429/8086/8255/files/nopulufajupasixi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1921/4756/files/35131066543.pdf
    • https://cdn.shopify.com/s/files/1/0445/3256/4132/files/funo_da_acetilcolina.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_off00007a18.bin
77dd614d04b049ed5dcb9b5e026ebcdf245e87e52511b703b74db380587f7c3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A18 5572 bytes
font_01_sfnt_off00008d18.bin
7790c9bfe487e5f6414c77b461963ca06a91d4194c496b3d2f7a579797ffba41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D18 10488 bytes

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