Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc2d2a6b9b44fd8…

MALICIOUS

PDF

33.9 KB Created: 2020-10-02 19:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0cba5cbc6432148cef2026166dc09695 SHA-1: f0a43df734ea233fc44b53321e8112181f9d846f SHA-256: 9dc2d2a6b9b44fd87635f646b3d257284e963deb1f984d9df5658704cf98f0b1
124 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The document body, though partially obfuscated, also contains the URL 'https://ggtraff.ru/strik?keyword=themen+aktuell+1+lektion+6-10+pdf', suggesting a lure to a malicious site. The presence of numerous links on disposable hosting further supports a malicious intent, likely for phishing or malware distribution.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?keyword=themen+aktuell+1+lektion+6-10+pdf In PDF document text
    • https://site-1036812.mozfiles.com/files/1036812/12292544542.pdfIn PDF document text
    • https://site-1039837.mozfiles.com/files/1039837/pugoram.pdfIn PDF document text
    • https://site-1037182.mozfiles.com/files/1037182/35522743368.pdfIn PDF document text
    • https://site-1036644.mozfiles.com/files/1036644/64266673805.pdfIn PDF document text
    • https://site-1037028.mozfiles.com/files/1037028/67222290417.pdfIn PDF document text
    • https://site-1037224.mozfiles.com/files/1037224/79048110820.pdfIn PDF document text
    • https://site-1037241.mozfiles.com/files/1037241/nukodokatulapudosozefumu.pdfIn PDF document text
    • http://benosid.learningaboutlife.net/uploads/1/3/0/9/130969060/kinusinekodezarite.pdfIn PDF document text
    • http://nedepo.obellahome.com/uploads/1/3/1/4/131452743/bojuxigodutodot.pdfIn PDF document text
    • http://files.southfield-lofts.com/uploads/1/3/1/3/131398171/pirokofozilim.pdfIn PDF document text
    • http://files.dena-robertson.com/uploads/1/3/0/8/130874296/sejiverodopiju_fuxivaleri_gugizef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/437f476b-5b10-4c9a-b506-60535b3a99b0/mofakiravuno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66b5651d-05ec-4dd8-b410-89dc995370ff/nukirovobofadewita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5192b6a-d847-4c8d-867f-1ff414ff3dd6/vonuwetoloxunodotijagasa.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000043d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x43D3 5400 bytes
SHA-256: 361fb26fe48afdef762b8c0bcdb6ba00e97eb97349129035516c6bc6ebb8f000
font_01_sfnt_off0000561a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x561A 10848 bytes
SHA-256: 13886f57e1cb05673435b9770f0fd45e4c0fd2ecc162a129245f73c1d14728b8

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