PDF malware analysis — malicious · 93ac90730f5e7b1d

MALICIOUS

PDF

43.9 KB Created: 2020-07-31 08:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: bdbed2d9bea766265b7a78fd406223ab SHA-1: 30fdd31044633d9c94fa8eacd98b742379b8aa39 SHA-256: 93ac90730f5e7b1d7ba7c64facace3891f0287e17adc98ddd9eab390b77dbe41

150 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass external link farm, with one URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'math worksheets for preschool pdf' and 'wkhtmltopdf', suggesting a lure. The presence of numerous Shopify URLs, while many are benign, indicates a strategy of distributing content through legitimate platforms to mask malicious links. The primary malicious IOC is the ttraff.ru redirector.

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.ru/pify?keyword=math+worksheets+for+preschool+pdf
- http://files.worzzler.com/uploads/1/3/1/4/131409309/1248b52f.pdf
- http://files.sassafrashealingarts.com/uploads/1/3/1/3/131398250/matemebivopo-buzamizoz.pdf
- http://files.goldenretrieversofidaho.com/uploads/1/3/1/6/131636654/3802901.pdf
- http://files.goldenretrieversofidaho.com/uploads/1/3/1/6/131636654/38
- https://cdn.shopify.com/s/files/1/0437/3273/0008/files/7726167660.pdf
- https://cdn.shopify.com/s/files/1/0436/9845/4693/files/26287257679.pdf
- https://cdn.shopify.com/s/files/1/0429/8915/8554/files/15659410242.pdf
- https://cdn.shopify.com/s/files/1/0429/8499/7017/files/najuzalesixededa.pdf
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fezusagofetivori.pdf
- https://cdn.shopify.com/s/files/1/0430/4509/3533/files/redofev.pdf
- https://cdn.shopify.com/s/files/1/0435/9772/5864/files/sesowafeximo.pdf
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84312174386.pdf
- https://cdn.shopify.com/s/files/1/0430/8421/8521/files/manenajexafetogirajavi.pdf
- https://cdn.shopify.com/s/files/1/0433/6903/7974/files/32822249678.pdf
- https://cdn.shopify.com/s/files/1/0435/5512/7459/files/zajakepepolebubuwer.pdf
- https://cdn.shopify.com/s/files/1/0429/6104/3605/files/nulowimafojo.pdf
- https://cdn.shopify.com/s/files/1/0434/1999/2222/files/zilarapurax.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_off00006e43.bin` `07ed5ab14c64cfbcbe4dc6c9ab28524697abddd06e284dab1de0a05656d89e13`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6E43	5036 bytes
`font_01_sfnt_off00007f97.bin` `2edaa535d197f72f1cbdc01f8e55aedb5c369a4d27157e730f15755ebcfa4330`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7F97	10084 bytes

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