Malicious PDF — malware analysis report

Static analysis result for SHA-256 50cdc8118274278a…

MALICIOUS

PDF

30.3 KB Created: 2020-04-12 10:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fda085dd216bdee806cc475f8b475c98 SHA-1: 228f12bc5a09fe3e68da0b262f70bc0ed0af3d78 SHA-256: 50cdc8118274278a43ce0331b39e77f6de3ea379af5a2539338a8bfa2205d59e
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links to other PDF files, a technique often used for SEO manipulation or to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious. The document body appears to be corrupted or contains minimal readable text, but the presence of numerous external links is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • 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.
  • 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://richkane.biz/uploads/1/3/0/2/130270762/130270762.html#a+girl+like+you+tabs+edwyn+collins
    • http://dandeliontrade.com/uploads/1/3/0/7/130775639/loxenajuwuvoro.pdf
    • http://andmerchant.org/uploads/1/3/0/6/130620619/nizelidowabakoripus.pdf
    • http://photographybyrausa.com/uploads/1/3/0/7/130776058/ed44dfa8df.pdf
    • http://able2bcounseling.com/uploads/1/3/1/4/131482950/zogiwadiv_fesozobol_devorepokirope.pdf
    • http://riskdataconsult.com/uploads/1/3/0/8/130874034/ace3a26e1b.pdf
    • http://dragonflyaerosolutions.net/uploads/1/3/0/5/130546153/wodesuwesewafomunis.pdf
    • http://top-knot-studio.com/uploads/1/3/0/4/130476068/detelota.pdf
    • http://c00pconsulting.com/uploads/1/3/0/2/130289395/ed014ab2b1394e0.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f09.bin
76ff6ddc27d5563098cf96a793eb3b5a881e1ac1189addfe4176f21124179b7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F09 7680 bytes

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