Malicious PDF — malware analysis report

Static analysis result for SHA-256 51bab1fcbdf1454b…

MALICIOUS

PDF

39.2 KB Created: 2020-04-11 15:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a0dc3ab0e791cc60cacb77ce50ba9e67 SHA-1: a3928dde83c6719a6155bb526c2489d6a766758f SHA-256: 51bab1fcbdf1454bae2fbfd798eb10094c35e9c0580386a241983e602d5f66cd
92 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a technique often used for SEO poisoning to drive traffic to malicious sites. The document body suggests a lure related to '16 cuentos latinoamericanos pdf grat', which is likely a keyword used to attract users searching for free PDF content. The ML classifier strongly identified this PDF as malicious, and the presence of numerous unknown-reputation URLs reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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
  • 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://oasiscateringar.com/uploads/1/3/0/4/130435577/130435577.html#16+cuentos+latinoamericanos+pdf+grat
    • http://timemaxx.net/uploads/1/3/0/9/130969580/wiwukajatudeg.pdf
    • http://liuboda.com/uploads/1/3/0/9/130969774/4795d2.pdf
    • http://wowbrows.net/uploads/1/3/1/3/131383283/lufilakabunafi.pdf
    • http://teacheronthemove.net/uploads/1/3/0/2/130288565/jajipob_xujinugomisinu_wajopaxajos.pdf
    • http://pitstopphotos.com/uploads/1/3/0/8/130814205/kaweg.pdf
    • http://qednaturals.com/uploads/1/3/0/7/130739892/17decd.pdf
    • http://motosurforlando.com/uploads/1/3/0/4/130483487/7745658.pdf
    • http://bmoss-works.com/uploads/1/3/0/3/130379527/fuxut.pdf
    • http://homebrewthrowdown.com/uploads/1/3/0/7/130740490/zowumavoxogeluvur.pdf
    • http://sunshinecoastmassage.org/uploads/1/3/0/9/130968935/zanaza_tagetiruwexemam.pdf
    • http://partydecorbynatalie.com/uploads/1/3/0/2/130272905/19a70306251bd.pdf
    • http://inspiringmummyclub.co.uk/uploads/1/3/1/6/131637365/jixowanabukijal-xarogewux-lomig.pdf
    • http://wowbrows.net/uploads/1/3/1/3/131383283/lufi
    • 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_off00006f75.bin
ff5b789d7d7126a8e8bd105a3f1b217a3582a287cda29715a3b8ccce11b860fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F75 9196 bytes

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