Malicious PDF — malware analysis report

Static analysis result for SHA-256 991dd398cadd680c…

MALICIOUS

PDF

66.0 KB Created: 2020-06-04 00:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34ff624cd87a021e2da78e1934a2e442 SHA-1: 6ad55fa20c0f6379f074bcabd51715fc426dea64 SHA-256: 991dd398cadd680c09016e503acd4c5cfa20304a9247af468b2c0a4fad00c2ce
94 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, many of which appear to be part of a link farm designed to artificially boost search engine rankings or redirect users. The primary URL found in the document body, http://buyorsellyours.com/uploads/1/3/1/0/131070301/131070301.html#red+dead+redemption+2+silver+chain+b, is also part of this pattern. The ML classifier strongly indicates maliciousness, supporting the interpretation of this as a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://buyorsellyours.com/uploads/1/3/1/0/131070301/131070301.html#red+dead+redemption+2+silver+chain+b
    • http://thebluecollardaughtersd.com/uploads/1/3/0/7/130739974/kegubamugela.pdf
    • http://wealthywellbeing.com/uploads/1/3/1/4/131438486/vileduvubavapezoji.pdf
    • http://campuscircle.org/uploads/1/3/1/8/131857920/6161908.pdf
    • http://mx.redbarnmontessori.org/uploads/1/3/0/2/130271217/zubejadileneranozif.pdf
    • http://biancagentry.com/uploads/1/3/0/4/130489833/lejezun.pdf
    • http://triciawackerly.com/uploads/1/3/0/6/130620677/8972153.pdf
    • http://paradiseboundadventures.net/uploads/1/3/0/5/130589147/futosa.pdf
    • http://peachykeenco.com/uploads/1/3/1/6/131636975/5150171.pdf
    • http://buyorsellyours.com/uploads/1/3/1/0/131070301/terms.html
    • http://buyorsellyours.com/uploads/1/3/1/0/131070301/dmca.html
    • http://buyorsellyours.com/uploads/1/3/1/0/131070301/policy.html
    • https://zemajuku.files.wordpress.com/2020/06/53518672367.pdf
    • https://dorupotidosu.files.wordpress.com/2020/06/vunokavesonomoniludi.pdf
    • https://juvavapu.files.wordpress.com/2020/06/bopanepaliveme.pdf
    • https://duroxonizisi.files.wordpress.com/2020/06/rinatexenipexip.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_off0000d587.bin
1987f53f5d0342de651f50f1ee553bf177a8e49146deabbdb5b0d25a7dbb6013		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD587 11244 bytes

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