PDF malware analysis — malicious · dbd74f356073f7b5

MALICIOUS

PDF

43.2 KB Created: 2020-07-10 08:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 0ee7b40d15aabcd7fc9ecd48472405ce SHA-1: d8fbdd47c0cf7a266e77c49a284db82e0f6b33ca SHA-256: dbd74f356073f7b5082f3c2cf767823259753c97bb96aa1d10ba9c07dc4fb7b2

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document is designed as a lure, promising free educational materials to entice users. It contains a high density of embedded links, many of which point to known malicious redirectors or are part of an SEO link farm designed to distribute malicious content. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK

PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
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.
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 https://ttraff.cc/wb?keyword=neet%20biology%20sample%20papers%20with%20solutions%20pdf%20free%20download
- http://files.bullochhallquiltguild.org/uploads/1/3/0/7/130774970/susoz.pdf
- http://files.lovemorelavender.com/uploads/1/3/2/8/132814969/sisowig.pdf
- http://files.themathsguy.com/uploads/1/3/1/4/131408537/2077725.pdf
- http://files.annotalegal.com/uploads/1/3/2/6/132695660/6b689.pdf
- http://files.allegrodancemusic.com/uploads/1/3/0/7/130740054/fovozo.pdf
- http://files.pittsborobaptist.com/uploads/1/3/0/7/130739120/3040083.pdf
- http://files.artichokegallery.com/uploads/1/3/0/8/130814340/rataxarojejof-jebib-jibokun-lorabepimot.pdf
- https://pogunuji.files.wordpress.com/2020/07/jatonaludivusebobekozuv.pdf
- https://lezidonopo.files.wordpress.com/2020/07/86859382183.pdf
- https://lalokoxon.files.wordpress.com/2020/07/19772957928.pdf
- https://nikiruweti.files.wordpress.com/2020/06/fobuzilubodike.pdf
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/27392185694.pdf
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/571475918.pdf
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rejupabofutub.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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00006a00.bin` `4ed1d19b871d1fbfe98374b7e618a16ec0dc100270521af1b11ff6ad7d3ca7c8`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6A00	5640 bytes
`font_01_sfnt_off00007d19.bin` `b5098ce46c8f01d34ef29e9bbf23c23c39eb85556517767cd75cf60983cc61eb`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7D19	10048 bytes

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