PDF malware analysis — malicious · dcb0040521b7f8d6

MALICIOUS

PDF

43.9 KB Created: 2020-08-18 17:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: e32ae6f7b3983fd3fe56f2d4dfd21d35 SHA-1: 10ea68457886df2fb20db072edab7b9486c17000 SHA-256: dcb0040521b7f8d6b9a00c7a772b539064a0ffca37d2275510478d4f32479f4c

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, with one pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was largely unreadable binary data, making it difficult to determine a more specific attack pattern beyond link manipulation.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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=agnisakshi+serial+song+video
- http://files.thedropuk.co.uk/uploads/1/3/0/7/130775871/metokefu.pdf
- https://cdn.shopify.com/s/files/1/0433/7709/8910/files/wifam.pdf
- https://cdn.shopify.com/s/files/1/0440/7237/0326/files/ahmedabad_heritage_city.pdf
- https://cdn.shopify.com/s/files/1/0429/1664/2975/files/car_diesel_engine_parts.pdf
- https://cdn.shopify.com/s/files/1/0429/6677/8009/files/kubif.pdf
- https://cdn.shopify.com/s/files/1/0435/9972/4702/files/29921231701.pdf
- https://cdn.shopify.com/s/files/1/0433/3495/9259/files/lg_chiller.pdf
- https://cdn.shopify.com/s/files/1/0434/8936/2082/files/2194742168.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00004bee.bin` `7167c7afc1eeb62801cd93d8d0cbd8a1dbe6f4263c0a44429ef62ab5c9c6ff48`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4BEE	4908 bytes
`font_01_sfnt_off00005c8c.bin` `4c83f5cef443cd8466315a3b7d62a94091930b51fc9cddc333cf27d61dd121b5`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5C8C	9956 bytes
`font_02_sfnt_off00007edd.bin` `226a8e4e528c820945b068501793868e9b71e899c703a7ad804f9a2f424011a5`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7EDD	16384 bytes
`font_03_sfnt_off000094a6.bin` `0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x94A6	4324 bytes

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