Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8ae40635e11ac26…

MALICIOUS

PDF

92.5 KB Created: 2020-08-29 17:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ea61d23875596a0e341aea071d6295e SHA-1: 2c92d6408c0a7bd3344891cec6f11499db94aeda SHA-256: e8ae40635e11ac26c285715daf38d7fad03e73202d525083b2019c14bb390c4d
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 likely used to host or redirect to further malicious content. The document body, though heavily obfuscated, contains the same URL and a keyword suggesting a lure. The PDF also exhibits characteristics of a link farm, with numerous embedded links, many pointing to static.usrfiles.com.

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=itachi+vs+kabuto+reaction
    • https://static.usrfiles.com/ugd/b8c837_29d15258593e44d387c7d55473aceaf8.pdf
    • https://static.usrfiles.com/ugd/b8c837_9c96f03232f04614b75e5c3fb64f32f6.pdf
    • https://static.usrfiles.com/ugd/b8c837_2b4af1d3e5da46b993c3cdf2095c5294.pdf
    • https://static.usrfiles.com/ugd/b8c837_b333c4d086224df4b36d7181bd313ca5.pdf
    • https://static.usrfiles.com/ugd/b8c837_07d133cd68a94983bde22cdd42526000.pdf
    • https://cdn.shopify.com/s/files/1/0435/0751/5558/files/rbi_grade_b_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0429/0881/1427/files/24817181694.pdf
    • https://static.usrfiles.com/ugd/b8c837_4622dc215d2e4f94b6f89ab7e5d0f771.pdf
    • https://static.usrfiles.com/ugd/b8c837_c60f0e16c4c7435696cc43e21fbc263b.pdf
    • https://static.usrfiles.com/ugd/b8c837_a2069fcc385d483c8417b5d2b6ac7d3a.pdf
    • https://cdn.shopify.com/s/files/1/0450/4390/8758/files/93281414368.pdf
    • https://cdn.shopify.com/s/files/1/0437/5258/7415/files/vejepibaboramadixefosax.pdf
    • https://cdn.shopify.com/s/files/1/0431/5054/0964/files/91415595951.pdf
    • https://cdn.shopify.com/s/files/1/0434/2887/2341/files/test_answer_sheet_doc.pdf
    • https://cdn.shopify.com/s/files/1/0430/9847/2605/files/wofusomekuzifogesu.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_off00012f59.bin
115325e8ebc51e0c1df82da927d348e8050e2556330cacf359acfa19844a909b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F59 5056 bytes
font_01_sfnt_off00014079.bin
1bd4d4d7f0f0849bc59a8e8a938889671ccfdcd16df4ce464155d5c922d8cdf5
pdf-font-stream PDF embedded font (sfnt) at offset 0x14079 10460 bytes