PDF malware analysis — malicious · 050512c029e730b4

MALICIOUS

PDF

44.0 KB Created: 2020-08-30 10:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 37d969240aded3c6bb9714d99cc7c05c SHA-1: 54b203ff4839c7ad56ddaf0ab25b333d5ff3997a SHA-256: 050512c029e730b4b6f786966ef1cafd413cf4f18ec9724132757a6cbca62e53

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains a significant number of embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/wix?keyword=pbds+study+guide+icu, which is flagged as malicious. The presence of numerous external PDF links suggests a link farm or a method to distribute further 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.ru/wix?keyword=pbds+study+guide+icu
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- http://www.daltonmaag.com/
- https://static.usrfiles.com/ugd/5af86b_cf6f8df2a3fc49e198ad294843d5ac40.pdf
- https://static.usrfiles.com/ugd/b8c837_35d3db8336d54936aa31c4e28ce2f8f0.pdf
- https://static.usrfiles.com/ugd/b8c837_04244193227144738393786ac1a82aa0.pdf
- https://static.usrfiles.com/ugd/3aee12_101e8f5226d84ff894c937a105c3a3f3.pdf
- https://static.usrfiles.com/ugd/c0b427_a25bbeb2700943418419e1126c842b35.pdf
- https://static.usrfiles.com/ugd/5fd5c1_f6cdf90867354076a9294000c8899c84.pdf
- https://static.usrfiles.com/ugd/162fe6_64fac655522c4ff994ad3231aec27d10.pdf
- https://static.usrfiles.com/ugd/b8c837_a780ce450f614092ad228dac8e8e6997.pdf
- https://static.usrfiles.com/ugd/a467d2_8980f061e6ba4a14b05a894a4118f250.pdf
- https://static.usrfiles.com/ugd/a48928_e60b633257ca46d391d9fa6a3be7ce70.pdf
- https://static.usrfiles.com/ugd/b8c837_18e8494cf40943e0be9e1329dd4ba16d.pdf
- https://static.usrfiles.com/ugd/3aee12_ea48e7bf701245a58b8f79c2eefc0fbf.pdf
- https://static.usrfiles.com/ugd/ecec20_445ee57b2049430590ae1c61db8a4870.pdf
- https://static.usrfiles.com/ugd/97368a_0cbe354197c041c4b379e2dfd0ef6065.pdf
- https://static.usrfiles.com/ugd/80bfa9_c96b49939be64b71b55a293eba269e60.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000061f4.bin` `20e375d480e409476b85e5cd3e1dee56165581661df3e35bc649e82cb2822287`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x61F4	4676 bytes
`font_01_sfnt_off000071ef.bin` `8367528faa15b238c460bc035ba0fb3d6fca77110ef43de35a6fc4c89b4a4591`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x71EF	10500 bytes
`font_02_sfnt_off00009548.bin` `1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9548	4324 bytes

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