Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b86bf2e395b68a8…

MALICIOUS

PDF

39.2 KB Created: 2020-08-29 15:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08218c1424016fcc867c0d822bc5cf3d SHA-1: 5273ee1891d3c7d442665056dd30d496b65013db SHA-256: 2b86bf2e395b68a8ad1d242e458a37decc5b5c6523909485d22b92da76aa1915
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a link to a known malicious redirector, ttraff.ru, which is designed to lure users to malicious content. The document body, though heavily obfuscated, contains this URL and appears to be related to browser configuration, likely as a pretext for the malicious link. The presence of numerous other PDF links, many pointing to static.usrfiles.com, suggests a link farm or SEO poisoning tactic to distribute the malicious PDF. No scripts were extracted from this sample.

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=configurar+ultrasurf+para+google+chrome
    • https://static.usrfiles.com/ugd/89363e_25e4f5c2ec5d4fdc911e0627b0d0ee34.pdf
    • https://static.usrfiles.com/ugd/b8c837_cd8249952bc24bebb0600f4ea38eabea.pdf
    • https://static.usrfiles.com/ugd/ace02d_a077212687c848d5a733f92bc2101f98.pdf
    • https://cdn.shopify.com/s/files/1/0435/2180/2404/files/17951486433.pdf
    • https://cdn.shopify.com/s/files/1/0431/7341/3028/files/21350138993.pdf
    • https://cdn.shopify.com/s/files/1/0432/8692/1376/files/printable_dice_template_with_numbers.pdf
    • https://cdn.shopify.com/s/files/1/0436/8157/9161/files/29082260209.pdf
    • https://cdn.shopify.com/s/files/1/0434/9827/4978/files/64823077003.pdf
    • https://static.usrfiles.com/ugd/b8c837_0542d7e62dce4f898f689f4d741368f4.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9a476d06f4149d8891dea33996ddab3.pdf
    • https://static.usrfiles.com/ugd/b8c837_2f3eccaf156e4af7859294b9918a49ba.pdf
    • https://static.usrfiles.com/ugd/b8c837_ca7bd45308a040af9b29010b968ec1ce.pdf
    • https://static.usrfiles.com/ugd/2c8d66_3c7e6c3f58404d4ab84c637e24341427.pdf
    • https://static.usrfiles.com/ugd/b8c837_8d9ffaeceb504c518a6638ab40a23277.pdf
    • https://static.usrfiles.com/ugd/b8c837_8181ecf9b67a4778851c6014f020d734.pdf
    • https://static.usrfiles.com/ugd/0a052f_604cd0335ee14e76875060452de7c4b3.pdf
    • https://static.usrfiles.com/ugd/b8c837_dad603711759498baecad27aba6bcb64.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.

FilenameKindSourceSize
font_00_sfnt_off00005a74.bin
521b794575638aa544e05109c9477111863ca68aa6408fa0b984b35c2b5a9cff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A74 5332 bytes
font_01_sfnt_off00006c6e.bin
e82b2b3b711cd38c5a4a12bee74836df7704baa74f3863b5e34b82f5f2e58252		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C6E 10372 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.