PDF malware analysis — malicious · 0510bf1b506e3c52

MALICIOUS

PDF

45.0 KB Created: 2020-08-30 05:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: f1a4b079ec7d3e7b1f4d6f5860d2cbf2 SHA-1: e4dc6454863dfdabd2bc3877637420fc63d9cead SHA-256: 0510bf1b506e3c52d4ec1d6f860f16bb381d3581f81c5474655ed0ac0b29906c

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by a machine learning classifier and contains a significant number of embedded links, many of which point to a link farm. One of the primary links directs to a known malicious redirector. While no scripts were extracted, the structure suggests an attempt to lure users to external, potentially malicious, 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://ttraff.com/wix?keyword=tiempos+verbales+en+ingles+estructur
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://static.usrfiles.com/ugd/b8c837_c8c1b7c2300c4639b99ccf2f4fdb7625.pdf
- https://static.usrfiles.com/ugd/374ce0_221710d6e994425ab0214acc96fd3dd6.pdf
- https://static.usrfiles.com/ugd/02beb7_e10db94649ca40b4bc0d6154519a2267.pdf
- https://static.usrfiles.com/ugd/b8c837_52637f0ed32840d0a19be67597a8bf2c.pdf
- https://static.usrfiles.com/ugd/e3834b_7bfa8a91e56a46f18454d9bfa3847a4e.pdf
- https://static.usrfiles.com/ugd/9b33c5_368c8fd6d1c04b1ebbda7b6d2598c20e.pdf
- https://static.usrfiles.com/ugd/b8c837_a2069fcc385d483c8417b5d2b6ac7d3a.pdf
- https://static.usrfiles.com/ugd/b8c837_2fd71d79b93a453780e69ced8386f8ef.pdf
- https://cdn.shopify.com/s/files/1/0434/7723/7917/files/detevowejewizumafiguwigi.pdf
- https://cdn.shopify.com/s/files/1/0432/3485/3021/files/bhagavad_gita_in_sanskrit_with_tamil_translation_pdf.pdf
- https://static.usrfiles.com/ugd/e3c460_ceb28a4f2c4d4b8fa635577ccef7d61a.pdf
- https://static.usrfiles.com/ugd/1b8612_5aa838c6e4c043a7afec79a6473d0319.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_off00006766.bin` `81538e29bad08474dba91f0a8a0c8751c0c87618e0ed1e8d27e4ac89b5cdfbcb`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6766	5404 bytes
`font_01_sfnt_off000079b1.bin` `9023205af15bc7ca8be0c6e53982645129d301078f8a630b47f31d8052f0f04e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x79B1	14312 bytes

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