Malicious PDF — malware analysis report

Static analysis result for SHA-256 b20dfdd810699eed…

MALICIOUS

PDF

42.7 KB Created: 2020-08-11 08:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bce1d6dad16f670e2a2cf729c2531175 SHA-1: 712ae6a760b0df9b263caa9156e6d586df6fda9d SHA-256: b20dfdd810699eed68d25f14e152224795135e798bd9954d29f2aa0877a61453
150 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector at 'https://ttraff.ru/pify?keyword=business+analysis+and+valuation+using+financial+statements+krishna+palepu+pdf'. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a link farm for SEO manipulation or traffic redirection. The ML classifier also strongly flagged this PDF as malicious. The document body, though partially corrupted, contains text related to business analysis and valuation, likely serving as a lure.

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=business+analysis+and+valuation+using+financial+statements+krishna+palepu+pdf
    • http://nepufo.lillyotasevic.ca/uploads/1/3/1/6/131606289/xusak.pdf
    • http://files.tophealthalternatives.com/uploads/1/3/0/7/130739525/1dfb05df0ecb41.pdf
    • http://files.guernsey-haviland.com/uploads/1/3/1/6/131636978/1900252ed87641.pdf
    • https://cdn.shopify.com/s/files/1/0436/5071/1705/files/zuzewepawanekip.pdf
    • https://cdn.shopify.com/s/files/1/0427/9664/6556/files/videbimubuniwariwibozu.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/bamaduvelajomabo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fisebupujavilugux.pdf
    • https://cdn.shopify.com/s/files/1/0431/0509/1745/files/satokusetinabut.pdf
    • https://cdn.shopify.com/s/files/1/0432/9403/2025/files/85997656115.pdf
    • https://cdn.shopify.com/s/files/1/0433/0877/7637/files/tacx_bushido_smart_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/4375/0049/files/mawilawumenenixoso.pdf
    • https://cdn.shopify.com/s/files/1/0435/5375/1189/files/bejutebedeferofawodime.pdf
    • https://cdn.shopify.com/s/files/1/0432/4658/3970/files/vofatexadirazimulolituvek.pdf
    • https://cdn.shopify.com/s/files/1/0438/6645/6224/files/xovutetigogiv.pdf
    • https://cdn.shopify.com/s/files/1/0438/2749/5072/files/xesigumoxisumaludojiv.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_off0000667c.bin
b2c2ba808b8aa74cf79ea70e0f124b469fe18e426444acc70a2b1e679cd9b83b
pdf-font-stream PDF embedded font (sfnt) at offset 0x667C 5844 bytes
font_01_sfnt_off00007a41.bin
b7eca1eb7a671a13c58c234fe5bc908231c1baeca73eb3a136343765cdb387b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A41 10196 bytes