PDF malware analysis — malicious · 7a7b4be0b4dcbaab

MALICIOUS

PDF

40.8 KB Created: 2020-08-30 08:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 49e617c554495bbf431fb7783c5b0608 SHA-1: 7eec6b9beaf7f25d92a0bf07254e5a70f19bbf04 SHA-256: 7a7b4be0b4dcbaab3210023e0272b5774e206315639cedcb7c5eecd782760a9f

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains a significant number of embedded URLs, with one identified as a malicious redirector. The ML classifier also flagged the PDF as malicious. The presence of a link farm suggests an attempt to manipulate search engine results or distribute further malicious content. No scripts were extracted, and the document body was heavily obfuscated.

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=tecnicas+de+investigacion+criminal+pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://static.usrfiles.com/ugd/67e251_2ce8b8d49a3e4a0c9d6829deac565c91.pdf
- https://static.usrfiles.com/ugd/d94ae5_b77a9abbe2144cc880a6b37d3e91ae1b.pdf
- https://static.usrfiles.com/ugd/b8c837_81e8c549e290426da2139fed73d8dbea.pdf
- https://static.usrfiles.com/ugd/b8c837_44b688098da540dca333d2bb75b5df94.pdf
- https://static.usrfiles.com/ugd/5438e3_61da27c7cf0847eeaf5d8b7ca42accba.pdf
- https://static.usrfiles.com/ugd/3b47cb_2a07991bcdc34b7c9bd2da8c6ff8f6d7.pdf
- https://static.usrfiles.com/ugd/b8c837_1426225cefd9417493bf0331e6b88b03.pdf
- https://static.usrfiles.com/ugd/eb5a6a_93a7e3ebf83e4883b7a737c1adcf8837.pdf
- https://static.usrfiles.com/ugd/e8506d_0f1464b8bdb44e5ab7e196d3f9a31ab9.pdf
- https://static.usrfiles.com/ugd/26938b_fa3da4e9170b436fb823a27bcbf04827.pdf
- https://static.usrfiles.com/ugd/822ecd_ffb4bc6a205a4af394715ab84b37180c.pdf
- https://static.usrfiles.com/ugd/b8c837_0f9e07a756ce49879421599252017b1a.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_off000060aa.bin` `e292054af9408e8a93606b914057702f17c9dcec472bf784f3b3fa6617dfb5a3`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x60AA	5484 bytes
`font_01_sfnt_off0000733e.bin` `160588342cd9134e8365fdf79bcdb196dbe3feaf2c013a21e649340f5cfe12bf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x733E	10832 bytes

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