Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec88c9ea4c2fc2c…

MALICIOUS

PDF

33.0 KB Created: 2020-06-11 21:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24629fdf179b7d983924fbeb05ad4f98 SHA-1: 2a53fdc813020723676c6fe8b6a838b76e466c2a SHA-256: 8ec88c9ea4c2fc2c8e3218ceac924f16390cf30c09d3b2d3afc35927fe2ed528
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' specifically indicates a large number of external links, with 'michaelarcati.com' being a dominant host. The document body text, though partially corrupted, contains the phrase 'Grade 3 math quiz pdf', suggesting a lure to entice users to click the embedded links. The ML classifier also strongly flagged this PDF as malicious.

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://wondertraveltours.xsideas.com/uploads/1/3/0/8/130874120/130874120.html#grade+3+math+quiz+pdf
    • http://michaelarcati.com/uploads/1/3/0/6/130620962/6d5a35cbb.pdf
    • http://vibehighbowspring.com/uploads/1/3/0/8/130873860/jesib.pdf
    • http://hijabeautiful.com/uploads/1/3/0/6/130639197/fotilugufisif.pdf
    • https://zapuxuj.files.wordpress.com/2020/06/45921302656.pdf
    • https://gorajeg.files.wordpress.com/2020/06/xubenolipovukabekumivarir.pdf
    • https://susobagiv.files.wordpress.com/2020/06/62895127886.pdf
    • https://lopititixuv.files.wordpress.com/2020/06/zoxilulumagaveb.pdf
    • https://dekabivegu.files.wordpress.com/2020/06/15431583760.pdf
    • https://rirewiza.files.wordpress.com/2020/06/58533632380.pdf
    • https://lomodusemuw.files.wordpress.com/2020/06/kuzup.pdf
    • https://beweramomuga.files.wordpress.com/2020/06/8936026928.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
stream_002_off000054d8.bin
94ab7906508cca1294762189de58593743f92a1281ebc3ced9c420dea39861be		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54D8 10732 bytes

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