PDF malware analysis — malicious · a04bfb804528ea5b

MALICIOUS

PDF

43.5 KB Created: 2020-08-15 08:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 21811f8df6265bb352258a6826729f21 SHA-1: e420041d3bddd446b688e362d1ef7114e22fedc0 SHA-256: a04bfb804528ea5b1d6327bfd7231efd1863e176eeceaa2e86c1223e8ceef0be

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, disguised as a Cisco Webex notification. The document body and embedded URLs suggest a link farm tactic, likely intended to drive traffic to malicious sites. 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/pify?keyword=cisco+webex+meeting++has+stopped+working
- http://files.authorkathrynperez.com/uploads/1/3/1/0/131070845/dujijupuwugufo_watibudazun_wumewifep_zuzejoda.pdf
- http://files.zamfitness.com/uploads/1/3/1/8/131856331/54f0fdb004.pdf
- http://files.loggerstrace.net/uploads/1/3/1/4/131437699/6699008.pdf
- http://files.shiningonesoflight.com/uploads/1/3/1/3/131380894/zorozixixovefi.pdf
- http://files.companionsofchrist.org/uploads/1/3/0/9/130969375/3234800.pdf
- https://cdn.shopify.com/s/files/1/0431/1092/4437/files/multithreading_in_c.pdf
- https://cdn.shopify.com/s/files/1/0433/7264/2460/files/functions_in_excel.pdf
- https://cdn.shopify.com/s/files/1/0437/6081/2193/files/welding_work_risk_assessment.pdf
- https://cdn.shopify.com/s/files/1/0432/3786/7687/files/jubuzuruzanewuve.pdf
- https://cdn.shopify.com/s/files/1/0434/4021/0072/files/toxireberozotubixijonor.pdf
- https://cdn.shopify.com/s/files/1/0432/5064/7202/files/dosuj.pdf
- https://cdn.shopify.com/s/files/1/0433/0032/3478/files/d_d_acquisitions_incorporated_free.pdf
- https://cdn.shopify.com/s/files/1/0428/6709/7756/files/jukamaserojeladixug.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_off000068b0.bin` `a3a1ad25ed5924e1de0e9faf04fa38a4275f2729fd54261b0954ef30353a03ac`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x68B0	5724 bytes
`font_01_sfnt_off00007c05.bin` `2425b13495e0278171477b8e53292719d543c29111db71f088bf893225f30aa4`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7C05	11264 bytes

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