Malicious PDF — malware analysis report

Static analysis result for SHA-256 984bcfebe473158e…

MALICIOUS

PDF

54.0 KB Created: 2020-10-10 17:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3b04bcfca7d126bcf448287a22d1c744 SHA-1: 4d0632e782605a28f38bc2d00503c903e96a1775 SHA-256: 984bcfebe473158e5025c74b347be2e91c21df23ade24aaa39e012edb7b38950
124 Risk Score

Malware Insights

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

This PDF document contains a link that redirects to known malicious infrastructure, disguised as a free download. The ML classifier strongly indicated maliciousness, and the document body itself contains the malicious URL. The presence of embedded URLs and the redirection to a link farm suggest an attempt to lead the user to a malicious site, likely for further exploitation or credential harvesting.

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://ttraff.link/pify?keyword=dental+decks+part+1+2017+free+download In PDF document text
    • https://site-1039378.mozfiles.com/files/1039378/juxoxasaratifopuguvo.pdfIn PDF document text
    • https://site-1043876.mozfiles.com/files/1043876/sobebumasugufotuwomava.pdfIn PDF document text
    • http://kakix.envisiongalleries.com/uploads/1/3/0/7/130738482/vupipuxaramufodo.pdfIn PDF document text
    • http://files.falmouthwaterfront.com/uploads/1/3/1/3/131381302/siwubeto.pdfIn PDF document text
    • http://supedoweg.asafcircus.com/uploads/1/3/1/4/131483627/wokuzufok.pdfIn PDF document text
    • http://files.helmphotography.com/uploads/1/3/0/8/130874148/2934147.pdfIn PDF document text
    • http://vakedu.slingerhighschoolband.com/uploads/1/3/1/3/131383591/78cc0372c44.pdfIn PDF document text
    • http://luditusaf.annarescuesquad.com/uploads/1/3/0/7/130775990/lipefikadogig_tunenibebubit.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/5d8c1faf-fcda-4be6-b930-432726f187ac/rezonegipadubupovaxepigej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9069778a-3484-4035-b932-d3d293aa5a7b/boditepalawa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f052ded0-861f-41c6-91e0-9c07c3fb05dd/60352146906.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/809869c4-1da4-41c3-88ad-c4334f1ac505/xorik.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00009cec.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x9CEC 26684 bytes
SHA-256: 3af25cd3bb5f0645313505ccfdc951d1ee4392a9bf94f9e9d752948a4f17c9c6
font_00_sfnt_off000063f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63F1 5712 bytes
SHA-256: 0eaa39cfb5545a16bea5afaf9ccbdf3538e5d6bd1bb25db3f3d9a93a21c9f2a6
font_01_sfnt_off0000779c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x779C 10864 bytes
SHA-256: 1c7d1adf97ac27bd5ec8f3dfad504d679949a3e296b2302956963faead629aa2

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