PDF malware analysis — malicious · 187012d9ca71a1c4

MALICIOUS

PDF

39.8 KB Created: 2020-08-29 03:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 460c9fdc45f3ceb760cada536ad2bbe3 SHA-1: 47e83ab8aaba07f8e9dde66294f3091301a730d0 SHA-256: 187012d9ca71a1c40a0b447944b847fd7f4ffeb1e2d800d6f2a11550044970f0

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, which is designed to lead users to further malicious content. The document body, though heavily obfuscated, contains a URL that matches the one found in the heuristics, suggesting an attempt to disguise malicious activity as educational material. The presence of numerous links to external PDFs, many of which are benign, likely serves to obscure the malicious redirector among legitimate-looking content.

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=word+families+worksheets
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://static.usrfiles.com/ugd/b8c837_e410d4f346c64079ac679105f1d659f9.pdf
- https://static.usrfiles.com/ugd/b8c837_8a11080f724b4a2cb24dc0a40c4d53e4.pdf
- https://static.usrfiles.com/ugd/b8c837_b6a6978593d34cf9a289c5df23707cec.pdf
- https://cdn.shopify.com/s/files/1/0429/8565/2375/files/mewusofepegak.pdf
- https://cdn.shopify.com/s/files/1/0435/9415/4146/files/gta_v_trophies_guide.pdf
- https://cdn.shopify.com/s/files/1/0440/7430/3640/files/christmas_carol_movie_mp4.pdf
- https://static.usrfiles.com/ugd/b8c837_868d8264d78d4aec8feb2fc91f93e382.pdf
- https://static.usrfiles.com/ugd/b8c837_e6b09d0ef47d445bb7a58f12c76a5975.pdf
- https://cdn.shopify.com/s/files/1/0428/2990/6079/files/19993648673.pdf
- https://cdn.shopify.com/s/files/1/0431/9051/7911/files/55031165013.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/
- http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00005d45.bin` `14c24dc8dbcf9d65aa6d96b90a7c34168191de61e3d42c2bbd1c7ac4d6dc9023`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5D45	5316 bytes
`font_01_sfnt_off00006f51.bin` `7a4988449d0e21c45b3cf4fe22d2ae64eda1db16f562e45690f0d5c046236aef`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6F51	10428 bytes

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