PDF malware analysis — malicious · e02d430a41cc121a

MALICIOUS

PDF

33.6 KB Created: 2020-08-30 18:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 1bbfc9811479a0635a37108abacf2073 SHA-1: 50cb9f3caa39e24cc631279fc4473ddd2113074b SHA-256: e02d430a41cc121a667b3c3923f9b7961af980a4f60172e5a27a1deeeac99b83

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

This PDF file contains a large number of embedded links, many of which point to a link farm hosted on static.usrfiles.com. One of the primary links, disguised as lecture notes, redirects to malicious infrastructure at ttraff.ru. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a SEO-based link farm designed to distribute 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=introduction+to+statistics+lecture+notes+pdf
- https://static.usrfiles.com/ugd/6cf392_4f1720b34eaf47bb90af5762da6e7482.pdf
- https://static.usrfiles.com/ugd/33ab24_1dc5f7ab98fc45aabd78788464eb82ff.pdf
- https://static.usrfiles.com/ugd/b8c837_2da413f5cc3649dbbd2e5839352d23f0.pdf
- https://static.usrfiles.com/ugd/7ea8bb_44446b3c1a6a4b4ba78a40b073a90c71.pdf
- https://static.usrfiles.com/ugd/599f1c_5b1811c20212426882c957502fd1178e.pdf
- https://static.usrfiles.com/ugd/f7fbc8_3c0580cfa46e4e96ac41363addfb056a.pdf
- https://static.usrfiles.com/ugd/93c935_d1050be6621b4ec9b5977d4af29b3e3a.pdf
- https://static.usrfiles.com/ugd/0bcf16_e493c21dafd248b897592f1001eecde4.pdf
- https://cdn.shopify.com/s/files/1/0435/5109/6991/files/zarifefe.pdf
- https://cdn.shopify.com/s/files/1/0437/6900/4190/files/karawoxagovatelulide.pdf
- https://cdn.shopify.com/s/files/1/0432/5107/3174/files/tumuxuwajenosafize.pdf
- https://cdn.shopify.com/s/files/1/0461/9445/8773/files/jugipazajukoz.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_off0000450e.bin` `ce1a87bf2ec21cf9fcb8fe65a1493b213a2e1518639c4def6b4fe55139936e50`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x450E	5088 bytes
`font_01_sfnt_off00005663.bin` `e4580a52c6f1da13b3dc5dc8f9b638cb2272d63b952e707dc0e769dc8c2de36a`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5663	10252 bytes

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