Malicious PDF — malware analysis report

Static analysis result for SHA-256 63fc8ce6b7e8f693…

MALICIOUS

PDF

64.5 KB Created: 2020-06-05 22:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6f933b522680bae115557bc43349812 SHA-1: b5f9f6b1a69e1cbc153b670f303ed401684ccf58 SHA-256: 63fc8ce6b7e8f69382ec0d7fedc32c837178fa2db3509ea042a386aaba83a3e0
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to other PDF files hosted on unrelated domains. This pattern is indicative of a link farm or SEO spam campaign, potentially used to distribute malware or phish for credentials. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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 http://mta-sts.mail.heirloomfurnitureandgifts.com/uploads/1/3/0/8/130874153/130874153.html#pattern+recognition+and+machine+lear
    • http://quiltsbycorrine.com/uploads/1/3/0/8/130813417/8ce4e127be71d67.pdf
    • http://lovebouquet.club/uploads/1/3/0/4/130475909/b3f9edb46849c.pdf
    • http://3b8.undesirable.us/uploads/1/3/1/4/131455232/6990991.pdf
    • http://whatweworeut.com/uploads/1/3/1/6/131636702/siradanivadoroxiwevo.pdf
    • http://2acraft.net/uploads/1/3/1/3/131398148/vezib.pdf
    • http://_dmarc.mx.fullspeedahedge.com/uploads/1/3/0/6/130639530/9709800.pdf
    • http://alifecarenursingagencyandstaffing.com/uploads/1/3/0/3/130380002/f53e31ea.pdf
    • http://pinkpastries.net/uploads/1/3/0/6/130621926/8340431.pdf
    • http://mta-sts.mail.heirloomfurnitureandgifts.com/uploads/1/3/0/8/130874153/terms.html
    • http://mta-sts.mail.heirloomfurnitureandgifts.com/uploads/1/3/0/8/130874153/dmca.html
    • http://mta-sts.mail.heirloomfurnitureandgifts.com/uploads/1/3/0/8/130874153/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bosoroju.files.wordpress.com/2020/06/muwegojatap.pdf
    • https://zutabav590496275.files.wordpress.com/2020/06/72678695207.pdf
    • https://relininomovu.files.wordpress.com/2020/06/xasitolapi.pdf
    • https://batewafa.files.wordpress.com/2020/06/23516520275.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b80f.bin
7b217ca487872bc1eb618ed26d6b1d77df0e3d508b2f3efd2007f86191e360d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB80F 11732 bytes
font_01_sfnt_off0000e0ca.bin
2b9a58732e62f9b2661c60555366173efb7a0f448c83249b96d7082548fc6b3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CA 16148 bytes

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