Malicious PDF — malware analysis report

Static analysis result for SHA-256 66312ad434d35f05…

MALICIOUS

PDF

44.4 KB Created: 2020-10-02 08:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 84db3ce9355e3f1f32a8465bf05ca0fb SHA-1: d88d57f20aab0bdaacd5befe9982c8ac99c33821 SHA-256: 66312ad434d35f05b0662052d71144c50a6dc38ce4e5fffd128dd8f68082e24b
94 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The embedded URL 'https://ggtraff.ru/strik?keyword=mathematical+methods+for+physics+and+engineering' is the primary indicator of malicious intent. While no scripts were explicitly extracted, the PDF structure and the presence of numerous embedded URLs suggest an attempt to lure the user to a malicious site, likely for phishing or malware delivery. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=mathematical+methods+for+physics+and+engineering
    • http://wobod.mrsjonescoldbrew.com/uploads/1/3/1/4/131438500/jukoba_xelodorotabim_zegoxeg.pdf
    • http://dolet.rebeccathein.com/uploads/1/3/1/6/131636648/fazawiligebusidebob.pdf
    • http://files.ieleaders.net/uploads/1/3/0/7/130776718/45c35ab516bd.pdf
    • http://gojaj.repa-program.org/uploads/1/3/1/8/131856819/1182291.pdf
    • http://files.catholiccharitiesvc.org/uploads/1/3/0/7/130776518/9722124.pdf
    • http://zakabox.extratimeconcierge.com/uploads/1/3/0/7/130775565/fc095a32a7.pdf
    • http://files.gradcincinnati.org/uploads/1/3/1/1/131164063/dugakiwizon.pdf
    • http://kosogase.briannaholt.com/uploads/1/3/2/6/132681976/4573931.pdf
    • http://mabakek.runningoutdemons.com/uploads/1/3/0/8/130813612/e2460aaaf9363.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1a7e2a67-b157-4c96-9fea-56a62c157688/memojibajoworiwifibevezu.pdf
    • https://uploads.strikinglycdn.com/files/800a03fc-a337-4c33-8edf-5d96cccee566/92334529895.pdf
    • https://uploads.strikinglycdn.com/files/b3263d9a-663e-4c71-839a-e012bbbf9f97/37469944813.pdf
    • https://uploads.strikinglycdn.com/files/bb81b54f-cb5a-41cd-ae4e-ca4f7f74a9c0/13006144584.pdf
    • https://uploads.strikinglycdn.com/files/cd121d0f-10d6-4350-8820-249e134dc8a0/71614189644.pdf
    • https://uploads.strikinglycdn.com/files/0375d9cd-0b5e-497d-b2dd-24d4732d1219/69121532327.pdf
    • https://uploads.strikinglycdn.com/files/42981ffb-a0e0-475a-8d78-ddb5ad9d618f/kuzirumalaloke.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_off00006cc1.bin
b903c86e3c17bad49cec74c79bbb206f2877fa7faa05b1a1e258b969d02d7e63
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CC1 5676 bytes
font_01_sfnt_off00008001.bin
ce020b331a492fbd6c1bd7196fcf4f6f29ed20332d01c511638a53d7c1989445
pdf-font-stream PDF embedded font (sfnt) at offset 0x8001 10776 bytes