Malicious PDF — malware analysis report

Static analysis result for SHA-256 8be0b84af6c46e83…

MALICIOUS

PDF

36.0 KB Created: 2020-10-01 21:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ed7effcda11997cacb2ffdf4b9fcdbf7 SHA-1: 385ee93d08b3bb44ca0c233aba8cd5309c8c2da2 SHA-256: 8be0b84af6c46e834cdff6705f09da4e3018ede2ea6bf5a8e8a79826395c83b2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, including one pointing to a known malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL that likely serves as the lure, suggesting a phishing or scam attempt.

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 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.
  • 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=chemistry+notes+o+level+pdf In PDF document text
    • http://sizosuro.oneeastpaloalto.org/uploads/1/3/1/4/131407014/lekamojuzef.pdfIn PDF document text
    • http://pesabivi.hoppyheat.com/uploads/1/3/1/4/131407178/zafigugafilazin_lutaxo.pdfIn PDF document text
    • http://mejudofu.foreveryoungesthetics.com/uploads/1/3/1/6/131636777/8066136.pdfIn PDF document text
    • http://kenami.sunnibunni.com/uploads/1/3/1/8/131857966/7286eaaeda82.pdfIn PDF document text
    • http://files.elitetrackandfieldacademy.com/uploads/1/3/1/8/131871537/1931011.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/a5d29cea-285e-415f-8250-83f63e051194/38874833138.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5e2415c-97d4-4192-9173-6c5932e17750/48514829393.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a55328e-b2a1-4cfd-bf8e-c3359d01ed1d/mugewizapigomenedopo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75209840-c92d-40d0-9461-71b150433eea/35236021902.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73482608-380d-4b17-adba-dff06278e5de/22699952754.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ce467f6-803b-460a-b7d7-51647c4c43b1/12398658679.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10d8ea5a-b276-413f-a96f-ab054a420212/31253091007.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60f4b403-5284-4f10-bff9-5e67db3bf98c/752548252.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/2200/2587/files/jenotevisozilapogit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6057/5899/files/hitchhikers_guide_to_the_galaxy_marvin_figure.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9318/1087/files/19128132651.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_off00004f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F13 5136 bytes
SHA-256: ea9288efc5859608e8b36265d17f32752743830f1b7c6e4538d26352d337b133
font_01_sfnt_off0000606d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x606D 10232 bytes
SHA-256: 8e5520f619107d8b2d7551d299871cd931d8a144d6e177f36018fbdb9dfe76c2

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