PDF malware analysis — malicious · 24649ec1041d5981

MALICIOUS

PDF

39.9 KB Created: 2020-08-16 20:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 1a880725cf092332732e86c65ea845c7 SHA-1: 07534acdc6ff09019f02bddb0e3554a7053b787b SHA-256: 24649ec1041d5981baed27c6da96026ba2eceb339b37e6e2796694397602413e

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning model as malicious and contains numerous embedded links. One critical heuristic identified a link to a known malicious redirector, while another noted a large number of external PDF links, suggesting a link farm. The document body, though heavily obfuscated, contains the URL that is also present in the critical heuristic findings. The primary intent appears to be SEO manipulation or redirection to malicious content via a link farm.

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=highlights.+com+hidden+pictures+answers
- http://vejopola.bikramstjohns.com/uploads/1/3/0/7/130739654/aa911b.pdf
- https://cdn.shopify.com/s/files/1/0428/5644/8156/files/63945919039.pdf
- https://cdn.shopify.com/s/files/1/0431/7410/1160/files/duzerubafibusiwoputova.pdf
- https://cdn.shopify.com/s/files/1/0431/2412/9952/files/kovixusuxoxoxusolosej.pdf
- https://cdn.shopify.com/s/files/1/0432/9376/9894/files/nozuvazutef.pdf
- https://cdn.shopify.com/s/files/1/0430/4325/8522/files/koxolejivafafuzixibakeda.pdf
- https://cdn.shopify.com/s/files/1/0433/5344/0414/files/pagijaganodapidagijozono.pdf
- https://cdn.shopify.com/s/files/1/0429/1887/1207/files/445553628.pdf
- https://cdn.shopify.com/s/files/1/0436/9154/0634/files/jolelinan.pdf
- https://cdn.shopify.com/s/files/1/0428/6890/0006/files/29094354807.pdf
- https://cdn.shopify.com/s/files/1/0428/0070/9791/files/footprint_calculator_worksheet.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_off00005c6c.bin` `5d235e2b4f3e3642fc076f9120d89e8fcdad9da6a8f61c53ed95a5ccc80914f1`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5C6C	5572 bytes
`font_01_sfnt_off00006f4b.bin` `5c2ce7b7d4e450e5fbb1ee807d3d8ba003d4600034f691784f59df86a89dca93`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6F4B	10488 bytes

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