PDF malware analysis — malicious · 530b31853b86646d

MALICIOUS

PDF

49.8 KB Created: 2020-09-01 03:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 1aa6ea2975f0a260dae363d7d87c7747 SHA-1: 06fe4f452e844ad46efeff50f4b280c68cc834f7 SHA-256: 530b31853b86646d75e7311c7b9726abd9a25048607bc73495c54b02849465b0

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL, suggesting an attempt to trick users into clicking it. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be a phishing lure disguised as a search result for medical information.

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.ru/wix?keyword=nccn+guidelines+2017+pdf+thyroid+cancer
- https://static.usrfiles.com/ugd/a8ca0f_89a41154fea147e9a5958e3c5c0bbd96.pdf
- https://static.usrfiles.com/ugd/0dd040_04d35b683b7e469d814fb6addf66cf70.pdf
- https://static.usrfiles.com/ugd/0d002d_11ef076f486640689ecc633cdbeb55d4.pdf
- https://cdn.shopify.com/s/files/1/0435/9723/4338/files/all_marvel_animated_movies.pdf
- https://cdn.shopify.com/s/files/1/0434/0501/7238/files/63703844613.pdf
- https://static.usrfiles.com/ugd/76156b_9a5fe4c3698943ab955489ee5d0551ba.pdf
- https://static.usrfiles.com/ugd/b48b60_f52072e204834e5bb8b4372c3f63e073.pdf
- https://static.usrfiles.com/ugd/74e9cf_97882463c925426996051427fb8b3daa.pdf
- https://static.usrfiles.com/ugd/0047a4_20bef7eb001c4231a1ee0a5ce1b045ac.pdf
- https://static.usrfiles.com/ugd/b8c837_15861b91b164477fb0af47f3fd67a988.pdf
- https://static.usrfiles.com/ugd/0adedf_be3b077a57924de68be9ff0856387d7e.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000074dd.bin` `2673caddb6605c7ec706e7e6f438763972433da7e9e3c8261f601a7882bb03c7`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x74DD	5776 bytes
`font_01_sfnt_off00008895.bin` `ed94421e8fc55fcd4d0a1ecd6489a0e01312230030ce73aaae5015cf3da811e0`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8895	10440 bytes
`font_02_sfnt_off0000ac50.bin` `9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xAC50	4324 bytes

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