Malicious PDF — malware analysis report

Static analysis result for SHA-256 4efbbfd1c431aedf…

MALICIOUS

PDF

39.6 KB Created: 2020-11-06 01:45:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: c265704b12135ccbccb7bf298b5ddd4d SHA-1: a5e016387af3845f68f5148e990f5b1bdbacf693 SHA-256: 4efbbfd1c431aedf470a9d40dd378263ee4b6a31a2a03d322c2fc57550aa73af
134 Risk Score

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://traffmen.ru/strik?keyword=minecraft+1.11.4.2+mod+apk+download In PDF document text
    • https://walijogopabo.weebly.com/uploads/1/3/0/7/130776167/titilegovaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366358/normal_5f87224dd3819.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421360/normal_5f9c669ae4395.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413375/normal_5fa4848ce3697.pdfIn PDF document text
    • https://wafodefa.weebly.com/uploads/1/3/4/4/134480145/8177454.pdfIn PDF document text
    • https://fidurelofomus.weebly.com/uploads/1/3/0/7/130740547/govaxugewepuxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369332/normal_5f9c24389af34.pdfIn PDF document text
    • https://dopuxaponaxu.weebly.com/uploads/1/3/2/6/132695391/89aefdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366309/normal_5f8860542d116.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455883/normal_5fa122e758284.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/gupisi/20352162843.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/mumezugawa.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/gosomepazamutobut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aced479-a25b-4be7-aa61-7ab861ac9f0d/bud_not_buddy_projects.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/buzulimidawawonedatet.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_off00005c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C36 5588 bytes
SHA-256: 7b05150c46485436b61e828ceccf7609f9361b30b516a904ac6edf3f88193054
font_01_sfnt_off00006f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F59 9944 bytes
SHA-256: ba19c7955ca293383751570be6936132f022b5d24f21aadebcce9ec77a6fb810