Malicious PDF — malware analysis report

Static analysis result for SHA-256 27765490702a3663…

MALICIOUS

PDF

39.6 KB Created: 2020-10-01 19:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e869bca66d7d6359a068cd654c059ec6 SHA-1: e7248fb95337882bf4e6f669769f713d6b69566f SHA-256: 27765490702a3663d8599cc40495a6d01ac7d3ea47820d25e3dcebb96004f07d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file contains a large number of embedded links, many pointing to disposable hosting services and redirectors, indicating a link farm for SEO manipulation. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://gettraff.ru/strik?keyword=arithmetic+geometric+series+worksheet+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary purpose is to drive traffic to malicious or spam sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://gettraff.ru/strik?keyword=arithmetic+geometric+series+worksheet+pdf In PDF document text
    • https://site-1037182.mozfiles.com/files/1037182/7125299655.pdfIn PDF document text
    • https://site-1036734.mozfiles.com/files/1036734/80735137461.pdfIn PDF document text
    • https://site-1036767.mozfiles.com/files/1036767/kesemewipasegasomenejuf.pdfIn PDF document text
    • http://files.studentprivacy.org/uploads/1/3/0/7/130776406/baxubikiv.pdfIn PDF document text
    • http://zexojugi.artunlockedwithjessicatookey.com/uploads/1/3/2/8/132814946/8636357.pdfIn PDF document text
    • http://diziz.belfairphotogroup.com/uploads/1/3/1/6/131607662/kanusoko_xawajujoxeni_dufefudusi_biguzenubasav.pdfIn PDF document text
    • http://files.mychildstherapy.com/uploads/1/3/1/3/131381288/2158757.pdfIn PDF document text
    • http://wapaduge.lmtcustomhomes.com/uploads/1/3/1/3/131398069/4825235.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/5788a347-9945-4d04-8def-1496ff836d9f/nubabewisexag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e73f8e4-bee8-4303-b2f0-7a4dfe68d0ea/33598059380.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40bdc61c-b436-452d-92dd-3b64f2f1014a/minakuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad075b3c-94c3-4640-982f-9e9bc9d9d0b7/sasekuganejola.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e39df0b-5b68-4e4b-8e70-b995756cbfc3/vimureruzije.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fb53f1f-efbb-4153-868f-8f60b66541bc/xokilewujobakadomizuket.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_off00005ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CA8 5472 bytes
SHA-256: f468199acea5319610843241935db5780f67079481aac3e5ea8a1dc85d2f122f
font_01_sfnt_off00006f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F35 10080 bytes
SHA-256: 66b0328bf036a6086cb3859cc7e784216dc443c476883485e21e09ad802b3de7

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