Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba5749ed6895eb68…

MALICIOUS

PDF

49.2 KB Created: 2020-11-04 01:56:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e7503c5039399269076f127cdd66dd1 SHA-1: 1bbb86644fe55c0be8c3fc70785ff16249b20952 SHA-256: ba5749ed6895eb68cffe9b34b52932ad345a1c6d8505cb4cb0a88a8998f576a1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM. One of the primary links, https://ggtraff.ru/123?keyword=grades+garden+emadrian+bilingual+school, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to the same URL, suggesting an attempt to drive traffic to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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://ggtraff.ru/123?keyword=grades+garden+emadrian+bilingual+school
    • https://kifelulamexeb.weebly.com/uploads/1/3/4/3/134310841/derafot.pdf
    • https://lujinelux.weebly.com/uploads/1/3/4/3/134361227/8681219.pdf
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/3532345.pdf
    • https://ganulexotugoris.weebly.com/uploads/1/3/1/1/131164012/5e3929ab40cfc.pdf
    • https://cdn-cms.f-static.net/uploads/4365660/normal_5f875b8a1dae1.pdf
    • https://bulasenojagaroj.weebly.com/uploads/1/3/4/3/134357248/bunobuxipaxogojanin.pdf
    • https://kurikezexiwu.weebly.com/uploads/1/3/0/7/130775092/4692169.pdf
    • https://xizukuzu.weebly.com/uploads/1/3/4/6/134606793/0652f6700c4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2348/2530/files/yakuza_kiwami_mister_master_trophy_guide.pdf
    • https://uploads.strikinglycdn.com/files/60be3681-c83a-4c04-af7b-7c8c731c910d/finally_rich_album_zip.pdf
    • https://uploads.strikinglycdn.com/files/6a08baf2-65ff-4f0d-977d-6c0f1d60107a/40518112832.pdf
    • https://cdn.shopify.com/s/files/1/0437/4206/8897/files/laptop_case_15.6_best_buy.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ec8.bin
8a8650d4a192418d40f24713d0c01e807c8e284dd410f5b98f4cb5e876e9325e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EC8 5524 bytes
font_01_sfnt_off00009162.bin
46608b4d3a8a54df428673d2019ce4759b6ed79ef76e67ee8647e4ebe03060b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x9162 11480 bytes