Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb8bc5d352db80ae…

MALICIOUS

PDF

44.0 KB Created: 2020-10-15 03:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 4cdf12bf2b63c84dc06f3551df61e36a SHA-1: 22ba3d199340cc66af521bbbed391a721e85dc4b SHA-256: cb8bc5d352db80aee07785e834479da12b44c49f80eef1f448d5226097adc3f4
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://cctraff.ru/123?keyword=implosion+1.2.10+unlocked+apk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366336/normal_5f8789517e4be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366978/normal_5f8773109edd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365525/normal_5f8779957658d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366034/normal_5f874dc2a77e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366402/normal_5f871be293815.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367000/normal_5f873a9051920.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366625/normal_5f871bd8abc0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368735/normal_5f8788eca25c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367308/normal_5f876db5b504f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365553/normal_5f87818ac001e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366364/normal_5f876878e1141.pdfIn PDF document text
    • https://site-1039775.mozfiles.com/files/1039775/89263716642.pdfIn PDF document text
    • https://site-1048442.mozfiles.com/files/1048442/gothic_2_returning_2_0_installation_guide.pdfIn PDF document text
    • https://site-1039444.mozfiles.com/files/1039444/fadipu.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/7581f834-17d0-473f-ad6e-780955047e4e/lomodakisivakamiju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c4ce590-cd32-488a-bcb6-769f38ac5f13/68377296195.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/559d0197-3bcb-423d-8416-e20371399fa8/2944904758.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bb943ea-92c1-4117-b057-1b7eb0a3622f/pelub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64b1639d-c01b-4d0a-b404-8006a637fb17/88238225015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae26fdfc-6e96-41f6-9039-f074d9cf82db/dedowirenuwerijelis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/152138f4-fd53-42bf-b918-d6cdbed8bc15/fumubos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc4d05e6-8ce7-44ec-84d7-885b2ffc2d5a/pozelewutela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/158c9c34-555e-4ed1-9b01-57a9f4b4350b/5635929025.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_off00006b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B1F 5484 bytes
SHA-256: 2298725a0c7340fe4bfa3e3cf637dc2f30ab354649a396cf25e49d79e4aeb9e7
font_01_sfnt_off00007db3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DB3 10804 bytes
SHA-256: b9e39b7b0cbb7a2ad921ce4f06463ff2e63ca07989b7cf9b14c690312d112d59

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