PDF malware analysis — malicious · 0f3cf84fff2f3400

MALICIOUS

PDF

44.8 KB Created: 2020-07-31 10:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: aa0406982dd6a3cf0b620a15890f2077 SHA-1: 3692ad3ff957315cfffe73ff19780c483e1c7593 SHA-256: 0f3cf84fff2f3400b9c8946f5e970dd0d8f9c3685ca7582d26812febe2861396

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The heuristic firings indicate the PDF is designed as a link farm, likely to direct users to malicious sites under the guise of providing educational content. The ML classifier strongly supports the malicious nature of this PDF.

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/pify?keyword=cambridge+primary+progression+test+stage+4+english+pdf
- http://files.alliesandfriendsmn.org/uploads/1/3/1/3/131380279/zugivina-xisajus-mutemobovovukil-kezamom.pdf
- http://files.goodforyourecords.com/uploads/1/3/1/3/131380612/zerures.pdf
- http://files.zenergymassage.net/uploads/1/3/1/4/131407635/993432.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://cdn.shopify.com/s/files/1/0437/2873/2314/files/tuzopuvefuka.pdf
- https://cdn.shopify.com/s/files/1/0436/7722/1017/files/tuzupunosozewum.pdf
- https://cdn.shopify.com/s/files/1/0428/0814/8127/files/bajulapokeruvidadep.pdf
- https://cdn.shopify.com/s/files/1/0429/1405/4300/files/simuzawegalo.pdf
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tulajemo.pdf
- https://cdn.shopify.com/s/files/1/0429/4760/8730/files/tuxemolirana.pdf
- https://cdn.shopify.com/s/files/1/0428/9137/8854/files/pumitidesi.pdf
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/67768868558.pdf
- https://cdn.shopify.com/s/files/1/0433/5930/5877/files/nupodo.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_off00006fdf.bin` `e26aa5435c90a184c312f4cfe52909636c0df03170b67cc530767ebd0035b8cc`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6FDF	5596 bytes
`font_01_sfnt_off000082c1.bin` `1728f161edf97f63ab411c7ec1fa9ba049e57fa97df0a36c311b23af94f5a720`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x82C1	10376 bytes

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