PDF malware analysis — malicious · 7aab25acf3cbd19a

MALICIOUS

PDF

43.9 KB Created: 2020-08-30 07:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: cdaa8561a61f1c44d806bc2f1bc963c0 SHA-1: 9c2d168521d96678e7c401fe95077435900704c4 SHA-256: 7aab25acf3cbd19a351abf6530a7fcbe67c7c9581305720b7c08df884843a062

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 known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to a 'general knowledge quiz' and the malicious URL. The presence of numerous external PDF links suggests a link farm or SEO manipulation tactic, likely to distribute further malicious content or host phishing pages.

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.com/wix?keyword=general+knowledge+quiz+2019+with+answers
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://static.usrfiles.com/ugd/33c377_4b110a07cf2c4edcb71767d1cf89be5c.pdf
- https://static.usrfiles.com/ugd/0d2908_9262431c6ce944f28979c1a7b6c7e771.pdf
- https://static.usrfiles.com/ugd/b8c837_45da52d625c44efcb53d7e24afddb6c0.pdf
- https://static.usrfiles.com/ugd/b8c837_9fc3d36a46744733bb5f2869e2f83ce2.pdf
- https://static.usrfiles.com/ugd/b8c837_f7b9fb9b682e4869984d66a7f46ebc8a.pdf
- https://static.usrfiles.com/ugd/b8c837_ec8fa0036ef7465ea804f506bcd2eca4.pdf
- https://cdn.shopify.com/s/files/1/0436/3033/0019/files/suzotopelarifuxevoxawi.pdf
- https://cdn.shopify.com/s/files/1/0427/8134/3903/files/86653958352.pdf
- https://static.usrfiles.com/ugd/07ef24_ba536f5a28e24aa48e07f485c131e395.pdf
- https://static.usrfiles.com/ugd/0dd040_15d22e9b08024e60ae17aa18ae5c2f1c.pdf
- https://static.usrfiles.com/ugd/5ad03d_34f74ed3d9a9449c95dab97f22f000da.pdf
- https://static.usrfiles.com/ugd/52b593_73a6dee3cd464961a5f6e504396a8543.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_off00006503.bin` `963cc7379750a3cbcc4dfbdb7dba7a99ccb2b39008090385e2ceeab43524014e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6503	5932 bytes
`font_01_sfnt_off00007947.bin` `21bcaa94b4e5138ed2b6de42d56965c2a291ad515b2f2654e047c8ca310623aa`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7947	13068 bytes

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