PDF malware analysis — malicious · 195701b7c4d36652

MALICIOUS

PDF

67.1 KB Created: 2020-09-01 20:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 210759cfe5a9aa59d0b69d96e5451376 SHA-1: 7c484578399fd9c7d17bb0454c82fbcd67be2e96 SHA-256: 195701b7c4d366526fc57d6ff273021f9f80337cf0b982a59eff6fde7cb2722c

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning attempt. One prominent URL, 'https://ttraff.me/wix?keyword=esl+worksheets+classroom+rules', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and other Shopify links, reinforcing the lure to external content. The ML classifier strongly flagged this PDF as malicious.

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.me/wix?keyword=esl+worksheets+classroom+rules
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://cdn.shopify.com/s/files/1/0429/7284/0090/files/mixuzupodasexizuwesi.pdf
- https://cdn.shopify.com/s/files/1/0439/6164/7262/files/56873137869.pdf
- https://cdn.shopify.com/s/files/1/0433/9764/4449/files/netixufafemugejareneg.pdf
- https://static.usrfiles.com/ugd/ef253e_2d0098ebb83042c7a4f7a934f1056cb4.pdf
- https://static.usrfiles.com/ugd/52b593_73a6dee3cd464961a5f6e504396a8543.pdf
- https://static.usrfiles.com/ugd/ae059d_7f4ff1a879cd4ca79d826008b6a2dd53.pdf
- https://static.usrfiles.com/ugd/8a419d_fa504688d1fd4461936e971b5ea846b6.pdf
- https://static.usrfiles.com/ugd/286fb8_77abdd6bc3e2425b972402fca5aa35ea.pdf
- https://static.usrfiles.com/ugd/73c254_138bed56d02e45b4be21b32f02283b25.pdf
- https://static.usrfiles.com/ugd/b85eb0_110d0edf10064e408479821c5ec44119.pdf
- https://static.usrfiles.com/ugd/defcb2_8cfba85a2b3b44c68a443d85bc477f44.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_off0000cb96.bin` `bdd0c53172ef625ea973b8f5ab773ea185089cf98e7f84b899229a977dcf2de4`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCB96	5152 bytes
`font_01_sfnt_off0000dd07.bin` `71f9078159747e61ffb46d56d3adca75d5ae54d8c608b6fb2f82c12cecac9cb4`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD07	10260 bytes

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