Malicious PDF — malware analysis report

Static analysis result for SHA-256 b35d53a8fe240521…

MALICIOUS

PDF

57.5 KB Created: 2020-08-02 23:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b16eeac0996898bbbccfaf4c2f12be8f SHA-1: 89cdb0efa0cba217d63ee9ff683c2e4410c551ff SHA-256: b35d53a8fe240521ca03c68c371c5ebce7475576564c6c3def779ca7644f2973
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various domains, including a suspicious redirector at 'ttraff.ru'. This behavior is indicative of a link farm designed to obscure the ultimate destination and potentially distribute malicious content or conduct phishing. The ML classifier also strongly flagged this PDF as malicious.

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=victoria+celeste+carvalho
    • http://files.mykhalid.com/uploads/1/3/1/8/131871817/48268c.pdf
    • http://files.counsellingwithnaomi.com/uploads/1/3/2/7/132741555/vepude_vijukurexu.pdf
    • http://files.robotics.marisths.org/uploads/1/3/1/0/131071063/golinafoxuxuletoder.pdf
    • https://cdn.shopify.com/s/files/1/0434/5217/0392/files/vadufawikikopid.pdf
    • https://cdn.shopify.com/s/files/1/0432/4022/6984/files/75716197277.pdf
    • https://cdn.shopify.com/s/files/1/0437/1608/3877/files/43411746679.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9534/files/victoria_secret_fashion_show_2016_replay.pdf
    • https://cdn.shopify.com/s/files/1/0430/8051/5745/files/33069416250.pdf
    • https://cdn.shopify.com/s/files/1/0432/1322/6143/files/zapotosemezubokowawe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0936/7461/files/lezibumadokegebumipu.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8871/files/kikosuvefarobos.pdf
    • https://cdn.shopify.com/s/files/1/0430/3834/3322/files/faxebemugomo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6880/8613/files/64811281518.pdf
    • https://cdn.shopify.com/s/files/1/0428/3459/1907/files/faxirojemube.pdf
    • https://cdn.shopify.com/s/files/1/0438/5007/2224/files/bezux.pdf
    • https://cdn.shopify.com/s/files/1/0433/8050/6791/files/navike.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000a611.bin
2a4ab6e7ec6b42db9ab9e0cf5f66813f8e205cd60b14502abadb5c4031303eff		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA611 18592 bytes
font_00_sfnt_off00005c10.bin
abc3cc7d4a2043c41f7b6f20a6f1652594744d1f6eb924ffdcd257827981928d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C10 4044 bytes
font_01_sfnt_off00006a63.bin
85c3688247c2b11cbd2c832b0b0d8b62f7663f640c7c32cb8deeafa1f9179757		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A63 4912 bytes
font_02_sfnt_off00007b17.bin
093d954b17fca664ed3f16fca5a1ad40c463c84a50549dad07a21d52d465346e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B17 13464 bytes
font_04_sfnt_off0000c271.bin
0d21202672fe4afe1cdb536534e5ba3b8cb76ba0801414ac1bed0e31161155c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC271 6192 bytes

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