Malicious PDF — malware analysis report

Static analysis result for SHA-256 3faa1781a0529a6f…

MALICIOUS

PDF

61.1 KB Created: 2020-03-23 16:02:57 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d93b7e4c072dac3ff357956e6a919a65 SHA-1: ca1956ae7ed7c62d5b5bb7c38f278ed8af4a236e SHA-256: 3faa1781a0529a6f888cb3acc3702b35f4f4a73c260614c166d1e2f41fadf3c9
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body contains text that appears to be metadata or junk, but also includes URLs that are likely part of a link farm or SEO manipulation scheme. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://rue28.com/uploads/1/3/0/7/130739559/130739559.html#the+age+of+innocence+book+characters
    • http://yaminoilmanagment.com/uploads/1/3/0/8/130813790/luvidekigixaduv.pdf
    • http://logosbusinesssolutions.com/uploads/1/3/0/8/130874620/c97634170e9.pdf
    • http://grupodacco.com/uploads/1/3/0/8/130874433/139186.pdf
    • http://www.prettyheavythings.com/uploads/1/3/0/6/130639899/f64b5508c590.pdf
    • http://broomsforhire.com/uploads/1/3/0/6/130604110/eddc32ed48.pdf
    • http://www.addglittersinlife.com/uploads/1/3/0/3/130323928/nolunexike-fagatini.pdf
    • http://pioneercareercenter.com/uploads/1/3/0/4/130477541/6512670.pdf
    • http://shorttermcaveatloans.com.au/uploads/1/3/0/7/130776315/66b0fe239f7221f.pdf
    • http://arabshortfilmfactory.com/uploads/1/3/0/2/130289453/8079005.pdf
    • http://getsocialfied.com/uploads/1/3/0/7/130739433/75a7b8039.pdf
    • http://webdisk.homesdomains.com/uploads/1/3/0/4/130491322/c2fe85921125c.pdf
    • http://royaldbasaritalynneministries.com/uploads/1/3/0/2/130288427/lowetin.pdf
    • http://casahabana56.com/uploads/1/3/0/6/130639708/a5b498a45e373.pdf
    • http://www.charcoles.com/uploads/1/3/0/6/130604470/6801364.pdf
    • http://mchumanesocietywi.org/uploads/1/3/0/9/130968911/mamibejedodela.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_off0000c457.bin
f2a0b5f95c240f42c68d9e5b44ed3dbf0b73450fb7dcdc37bd544fe1daacac1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC457 8772 bytes

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