PDF malware analysis — malicious · c9388d5b683ce32f

MALICIOUS

PDF

42.5 KB Created: 2020-08-14 12:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: a6aed6ea53e6d3f4caf5c6f0ae84ba84 SHA-1: 1ec6fb6f9d0440883f18dd985b57d175b5994d64 SHA-256: c9388d5b683ce32fb5bcc0d205499004b5560999e3a87790009f7fa4c5a33baa

150 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains numerous embedded links, with a critical heuristic identifying a malicious redirector. The document body, though heavily obfuscated, contains text related to an 'algebra word search puzzle answer key' and includes the malicious URL. This suggests a social engineering lure to redirect users to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 3

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.
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/pify?keyword=algebra+word+search+puzzle+answer+key
- http://files.julielordsart.net/uploads/1/3/0/7/130776253/5195786.pdf
- http://files.emmaandjasonsayido.com/uploads/1/3/2/6/132695629/xawovobopijasu_dezosimus_buvoti.pdf
- http://files.longhirstopengardens.org/uploads/1/3/1/4/131406739/meguxigomabip.pdf
- https://cdn.shopify.com/s/files/1/0436/2865/8848/files/muwotigezomezozozabe.pdf
- https://cdn.shopify.com/s/files/1/0434/3886/6584/files/lenavaduwijuzibazef.pdf
- https://cdn.shopify.com/s/files/1/0434/8346/3832/files/9574027182.pdf
- https://cdn.shopify.com/s/files/1/0437/2132/6742/files/88296025496.pdf
- https://cdn.shopify.com/s/files/1/0430/5613/6341/files/29792147970.pdf
- https://cdn.shopify.com/s/files/1/0430/7304/4642/files/93170594987.pdf
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/voriwatovetizejewadodo.pdf
- https://cdn.shopify.com/s/files/1/0430/8316/9943/files/61365180818.pdf
- https://cdn.shopify.com/s/files/1/0433/9482/6396/files/1570023942.pdf
- https://cdn.shopify.com/s/files/1/0431/8894/5045/files/89998014359.pdf
- https://cdn.shopify.com/s/files/1/0429/9243/5359/files/nivigodovulataxu.pdf
- https://cdn.shopify.com/s/files/1/0434/7432/1560/files/20699046418.pdf
- https://cdn.shopify.com/s/files/1/0437/1261/0472/files/67861010239.pdf
- https://cdn.shopify.com/s/files/1/0431/0522/2822/files/35547699736.pdf
- https://cdn.shopify.com/s/files/1/0437/7070/8125/files/5163166372.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_off0000670f.bin` `21928f1bee9bc791cf057ac67043afb5d8ed61e2b5a3df6f5ada65153b9181a1`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x670F	5772 bytes
`font_01_sfnt_off00007ac6.bin` `bf3be5e776bf9f4cc84ce1330c8886aeb08834d31c4952f3aa80a866d4346928`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7AC6	10004 bytes

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