PDF malware analysis — malicious · 791b20610a8ce64e

MALICIOUS

PDF

33.5 KB Created: 2020-08-29 20:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 30f7499fdf47bd3d32cc525c80a2f6bd SHA-1: d0abea22294896ac846ccd19591a6e8d1ec8bb96 SHA-256: 791b20610a8ce64ecd0d3d8b2e3411bd9d92f4aad169e7c552eee5e9fc34d9ed

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains URLs that appear to be part of a link farm. The primary malicious IOC is the redirector URL, which likely leads to a phishing or malware distribution site.

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/wix?keyword=spiegel+im+spiegel+sheet+music+violin+piano
- https://static.usrfiles.com/ugd/b8c837_277be9e0bb5047dc8b8d9105d319aac5.pdf
- https://static.usrfiles.com/ugd/b8c837_35d44c59c529476e80f9d841938486a2.pdf
- https://static.usrfiles.com/ugd/b8c837_7f6ba444c7db4b49a039b5a1b5b8059a.pdf
- https://static.usrfiles.com/ugd/b8c837_f7b557e2baab4bf5881c387455893c6a.pdf
- https://static.usrfiles.com/ugd/b8c837_37ebca5215094a1cb1e566d6df96baff.pdf
- https://static.usrfiles.com/ugd/b8c837_189ad59eae1f4411ac9b7abda0c0600d.pdf
- https://static.usrfiles.com/ugd/b8c837_3683eb330c6b48d8a4545261a89254fb.pdf
- https://static.usrfiles.com/ugd/b8c837_80cac8eeca774c5aaaac7f0051ac1ef8.pdf
- https://static.usrfiles.com/ugd/b8c837_c73cfb7d4e44477f809a204966db6af4.pdf
- https://static.usrfiles.com/ugd/b8c837_c888e8bd03584673869bf0b0a5d6cd2f.pdf
- https://static.usrfiles.com/ugd/735189_a0dd703e1a7241aba6d4d4781eba233b.pdf
- https://static.usrfiles.com/ugd/b8c837_ed426657fc0c469bba22da7019b26597.pdf
- https://static.usrfiles.com/ugd/097bd5_e3b16e12cf2743dda63ba95a9708fbd0.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_off0000443b.bin` `b4fc156e7757006bc0968c403f2d07b4d9eff07af092f8630d5a84782b67d604`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x443B	5412 bytes
`font_01_sfnt_off00005694.bin` `ce85b34158a8609e1638912b2276c46b95883611126138210c3a16cad893d046`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5694	10184 bytes

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