PDF malware analysis — malicious · b9b8a740f62a4d27

MALICIOUS

PDF

42.8 KB Created: 2020-11-06 03:02:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: f938919d8428b205f252914fbd6166a5 SHA-1: 17613808ca2c34d0106d881b1785d20f9f75efa6 SHA-256: b9b8a740f62a4d27d79143bec2112c0cda493640abbe63e58442deb985278e64

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with at least two pointing to known malicious redirector infrastructure and link farms. The document body, though heavily obfuscated, contains a URL that matches one of the identified malicious links. The presence of many external links suggests an attempt to drive traffic to potentially malicious or SEO-farmed 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://cctraff.ru/123?keyword=ikea+circus+tent+for+kids
- https://kuburabet.weebly.com/uploads/1/3/4/3/134362545/faxufubokiwizixasu.pdf
- https://nawowelefet.weebly.com/uploads/1/3/4/4/134498780/wotokofakafon.pdf
- https://tevirilozarenov.weebly.com/uploads/1/3/2/6/132695732/bebid_nimosuvesujeb.pdf
- https://kuliwulakut.weebly.com/uploads/1/3/4/5/134523122/gatijadabuxupaboma.pdf
- https://gonerogad.weebly.com/uploads/1/3/1/4/131438616/5c35e9d.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://uploads.strikinglycdn.com/files/f558c1bc-3def-4bb0-b933-109cca83aab3/sigudijasigiwe.pdf
- https://s3.amazonaws.com/gateme/autumn_immunology_conference_2018.pdf
- https://uploads.strikinglycdn.com/files/d645530d-0cea-48bc-b3a9-ffa230a4ee2d/pafobulaveluxesimiz.pdf
- https://uploads.strikinglycdn.com/files/ff746011-fbf8-47c1-ab12-2968a59c9f49/degutusiju.pdf
- https://uploads.strikinglycdn.com/files/8edb5c7c-fde6-4d3b-a814-496210f5fba1/dexezasitewulekijafene.pdf
- https://s3.amazonaws.com/rerinago/raisin_in_the_sun_poem.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_off00006681.bin` `9d20fe885ffac9fb4d10e0c1a15a9e9c4c5e60b004e69d90f9cf5894bbd988d5`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6681	4984 bytes
`font_01_sfnt_off00007785.bin` `541f7e9fcd7e3790573a8c5e32517198ffe6a02f79dec25956548a255e70d45c`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7785	11532 bytes

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