Malicious PDF — malware analysis report

Static analysis result for SHA-256 fba773ddfc91ede5…

MALICIOUS

PDF

40.8 KB Created: 2020-10-06 23:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 6eb5c109d13ce232c87d5ea5d7c87624 SHA-1: e8fdcb70be6d28d8b51c57b3f3a4fd77c1fa45bd SHA-256: fba773ddfc91ede57479db970f73cc5d8bffa34f1c224771aad18f1284e63643
164 Risk Score

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not 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=8th+grade+spelling+bee+words+scripps In PDF document text
    • https://site-1039800.mozfiles.com/files/1039800/tavowazugudixivemineduxi.pdfIn PDF document text
    • https://site-1037214.mozfiles.com/files/1037214/najumezolifilanadisitawak.pdfIn PDF document text
    • https://site-1036910.mozfiles.com/files/1036910/sajikedizav.pdfIn PDF document text
    • https://site-1048522.mozfiles.com/files/1048522/vofotiluregiru.pdfIn PDF document text
    • https://site-1039332.mozfiles.com/files/1039332/29780295669.pdfIn PDF document text
    • http://files.privatecounsellingandmediation.com/uploads/1/3/1/6/131637308/daresijuror-lukupo-kimatut-guloxamaj.pdfIn PDF document text
    • http://doxaruba.servdmelbourne.com/uploads/1/3/0/8/130874359/177922364e1a3f7.pdfIn PDF document text
    • http://files.refracted.net/uploads/1/3/0/7/130740191/bamoparav-gulaj-tosuvino-mifukufabuzazul.pdfIn PDF document text
    • http://files.sfvcca.org/uploads/1/3/1/4/131437295/46bbf84e7ed.pdfIn PDF document text
    • http://womasu.longlakeanimalhospital.com/uploads/1/3/1/6/131637037/7310740.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/a3540420-6177-4560-a161-167a642865d6/dedaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1a2dab3-4378-41a0-ada0-001198e057a6/nidenitanibonevazune.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88b0fd04-bd22-4c9a-bd84-f1689a241982/votodevikifutovuwakuzax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acde5176-c85b-493b-903d-0ab603c0e3d0/67219519817.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd4b32c9-15e8-4291-ba80-0718c918eb94/dijoviletevukivarusogex.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_off000061c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61C1 5664 bytes
SHA-256: 4d9799d56068afc623d33c3776e53caac8bff9e1e5663eb2321ab8c6cb4b97dd
font_01_sfnt_off0000750b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x750B 9804 bytes
SHA-256: 4572abb483bebe6b74c83838f7e1da31cce17d4ce925dbd919a457444c324d76

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