Malicious PDF — malware analysis report

Static analysis result for SHA-256 97f51343c4c3add1…

MALICIOUS

PDF

57.8 KB Created: 2020-10-25 23:54:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 35fa67ad5a0c4ad777ac3b9524473139 SHA-1: 91027a9d71c140c300e0c99437f24f5e69cc15fe SHA-256: 97f51343c4c3add186a064bf48c89e8c876dad851affc3d7f12f16b734c4f213
184 Risk Score

Malware Insights

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

This PDF file is identified as malicious due to its function as a link farm, directing users to known malicious redirector infrastructure. The embedded links, such as 'https://cctraff.ru/aws?keyword=2020+calendar+printable+pdf+south+africa', are designed to deceive users into visiting potentially harmful sites. The ML classifier strongly supports the malicious verdict, and the heuristic firings indicate a deliberate attempt to leverage link farms for malicious purposes.

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://cctraff.ru/aws?keyword=2020+calendar+printable+pdf+south+africa In PDF document text
    • https://sozivutapadonen.weebly.com/uploads/1/3/1/1/131164462/zugabile.pdfIn PDF document text
    • https://giwakatunu.weebly.com/uploads/1/3/1/4/131437107/woxesegela.pdfIn PDF document text
    • https://kuvofexe.weebly.com/uploads/1/3/1/1/131163751/wenosadi-zewinatogedavur.pdfIn PDF document text
    • https://rabexowubomisuw.weebly.com/uploads/1/3/1/4/131407155/6730531.pdfIn PDF document text
    • https://tenabawik.weebly.com/uploads/1/3/2/7/132710661/jesugudilose_nenudasajufoj_wizemozexowom_wuwowudu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379231/normal_5f8d6267cc8c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369309/normal_5f8c9a0138e3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372377/normal_5f8b718529307.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365602/normal_5f8be2593e20f.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/pejajofedaxevaw_kozadesupuke.pdfIn PDF document text
    • https://zotorakiv.weebly.com/uploads/1/3/0/7/130739478/xebikuzabitawi.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/jodofalem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/agricultural_economics_rk_lekhi_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/pdf_to_word_converter_software_free_download_filehippo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55869897-b70a-4962-b5d9-bc57c888485b/92448627720.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bbb6552-0a5d-4779-b1d0-e9b56febb88c/77042552681.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3fb63c0-84d5-4989-80af-421ab1691d7b/24020247672.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a510907-f657-4ede-819f-09a3271d2fd6/vosavuzomusidev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7168c54-0fed-4aea-8181-c4509abcfdfc/ravutijuwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cfdd620-488e-4639-bb27-b2c48dfdde7e/51123461053.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e186112-51b7-4d0b-a691-669dc789bb20/najimaworanurawuzid.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_off0000a1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA1D6 5560 bytes
SHA-256: 7fdee62b2799f31c0b248a66db49846eeeccb480309cd1306327fd84b61f1aff
font_01_sfnt_off0000b499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB499 10892 bytes
SHA-256: 7c68fed12eea41ab519000880e605d6770ed368c8259ec26bb23583ae8f7b6b4