PDF malware analysis — malicious · 506eabb8147bb81b

MALICIOUS

PDF

45.3 KB Created: 2020-08-29 23:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: da0103e30927d98251d8054cac5f4119 SHA-1: 21bca313f982aef08a35a336791ca237c9d92a8d SHA-256: 506eabb8147bb81b1e5e537362d66488b69a4168dd9bea3b0516f552a64977eb

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious due to its inclusion of a link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that triggers this redirection. The presence of a large number of external PDF links, many pointing to the same dominant host, suggests a link farm intended to manipulate search engine results or 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.cc/wix?keyword=mod%25C3%25A8le+de+lettre+%25C3%25A0+un+ministre
- https://static.usrfiles.com/ugd/b8c837_eb337cc5f30340fc93be43de54c95934.pdf
- https://static.usrfiles.com/ugd/b8c837_814beba33fbf4176a8a69cdb8eead0bf.pdf
- https://static.usrfiles.com/ugd/9ea9b6_1ae5f8d074e94e84b770e8b1e7a283a8.pdf
- https://static.usrfiles.com/ugd/b8c837_6f7f3190808d45b599d585a6502508f3.pdf
- https://static.usrfiles.com/ugd/b8c837_16d63047691748e19d09bcab43da2467.pdf
- https://cdn.shopify.com/s/files/1/0434/9450/6661/files/tetanus_toxoid_adalah.pdf
- https://cdn.shopify.com/s/files/1/0435/2373/5720/files/66757473293.pdf
- https://cdn.shopify.com/s/files/1/0436/4802/4741/files/42218920950.pdf
- https://cdn.shopify.com/s/files/1/0440/1509/1870/files/clerical_ability_test_questions_and_answers.pdf
- https://cdn.shopify.com/s/files/1/0435/0767/9397/files/93114563478.pdf
- https://static.usrfiles.com/ugd/b8c837_7179e4a896db4a4b8894c3dffc7416ca.pdf
- https://static.usrfiles.com/ugd/69695d_91fcb0a6dfc64affb46b968d96bf4f03.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000696a.bin` `bf69fca105ec0cf819747fee2aa3c7deaa4b22df850ab4103e9d3e332e8f9da8`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x696A	5140 bytes
`font_01_sfnt_off00007a7f.bin` `157643eec3e86d43e6d70d42b384dfb5fd27d486b11eff4fbca8bb8f3772a607`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7A7F	14952 bytes

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