PDF malware analysis — malicious · dca43aa26fcc7f0c

MALICIOUS

PDF

36.9 KB Created: 2020-08-30 07:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: dac5dd6f155a050aec194895ead20a03 SHA-1: aa327d7bd9e08befd7bfdbe1617448fdfc34bd78 SHA-256: dca43aa26fcc7f0c914d390a71faeb7292b6b621912c6f774dae1137f471a923

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm with 24 external links, including a redirector to a known malicious domain. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which is likely used to lead the user to a phishing or malware distribution site. The document body text is garbled, but the presence of the URL and the heuristic firings are sufficient for this assessment.

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=oracle+11g+architecture+interactive+quick+reference
- https://cdn.shopify.com/s/files/1/0432/9806/2501/files/presente_simple_interrogativo_en_ingles_ejercicios.pdf
- https://cdn.shopify.com/s/files/1/0429/4891/9450/files/57667626957.pdf
- https://cdn.shopify.com/s/files/1/0434/4479/7605/files/tp_link_login_page.pdf
- https://static.usrfiles.com/ugd/b8c837_e8353486f17742b387d5f83487f42cb9.pdf
- https://static.usrfiles.com/ugd/1cc7e8_c1270a3665e648bf8678e4ec9f4801c1.pdf
- https://cdn.shopify.com/s/files/1/0438/3545/7698/files/60447630651.pdf
- https://cdn.shopify.com/s/files/1/0430/4335/6825/files/mirokepowu.pdf
- https://static.usrfiles.com/ugd/0a052f_604cd0335ee14e76875060452de7c4b3.pdf
- https://static.usrfiles.com/ugd/b8c837_19e102540730479fa24403e4e216ae7d.pdf
- https://static.usrfiles.com/ugd/9c0842_3faa563902b04acabbc3de734c441fe7.pdf
- https://static.usrfiles.com/ugd/b8c837_2b5273dffdb441f7a8ceb13b5a741aba.pdf
- https://static.usrfiles.com/ugd/510a18_b6b425df5cc144f6b0d6af4ccc5bf1e8.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_off0000513a.bin` `60c2450017807eb462bbc2167152957e5de12bd6f4eb4825dc5f24c2007b5ba5`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x513A	5292 bytes
`font_01_sfnt_off00006342.bin` `d9449ec7a422aed61caa8222592430fadcb691e03b7f2ccf0fe41d0e28044e61`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6342	10416 bytes

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