PDF malware analysis — malicious · 6fcf11cabd59c5ef

MALICIOUS

PDF

45.2 KB Created: 2020-09-02 23:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: f3ba15e046001422a7305d77f9b0f04f SHA-1: 3d523ba9b4e7c1a0bc7f80b7dc878e8fe5330a86 SHA-256: 6fcf11cabd59c5ef81b44105f0ba833f5322e37fd6cd170f4398174526fd635d

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, one of which points to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'ukasl asbestos awareness answers' and the malicious URL. The ML classifier strongly indicates maliciousness, and the presence of numerous external links suggests a link farm or redirection tactic.

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.club/wix?keyword=ukasl+asbestos+awareness+answers
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://static.usrfiles.com/ugd/97368a_2c4eedaa9020453db07a09099d578509.pdf
- https://static.usrfiles.com/ugd/941881_f251b94a8e584b79aec486b5e74b49f1.pdf
- https://static.usrfiles.com/ugd/7d1dc9_2dcf572b15f04649b2870402d3cdd7d5.pdf
- https://static.usrfiles.com/ugd/d54300_adce7db158db45e2906e3276b48b6343.pdf
- https://static.usrfiles.com/ugd/b8c837_57a055deee8445489e7134244864cbe1.pdf
- https://static.usrfiles.com/ugd/c8a981_7b583a9fff86445b9d4d8596b0f2a484.pdf
- https://static.usrfiles.com/ugd/6846fe_8ebf42ac261e47c4ab9e0076183dcf6d.pdf
- https://cdn.shopify.com/s/files/1/0427/7963/9967/files/bodirugepalusiwu.pdf
- https://cdn.shopify.com/s/files/1/0448/2488/7456/files/cassation_decision_volume_19.pdf
- https://static.usrfiles.com/ugd/3b47cb_fd0917e9e45047d1b8603e7d50f96a1b.pdf
- https://static.usrfiles.com/ugd/f3cb45_c89f2cce8e214ca697d5918d3ef4a71f.pdf
- https://static.usrfiles.com/ugd/b972d5_0794d007d1f04afd84c906432d5c1ae2.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_off000075ca.bin` `3c79186b939ae362322c73fdeba89f0223af5c9efc816c7ff4fbf858427e92a5`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x75CA	4964 bytes
`font_01_sfnt_off000086d2.bin` `db0a43390e669907c4b325884870f0d2494e85b2535dd9d2dcb8b216359fd2b7`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x86D2	9836 bytes

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