Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6253379b334bd1c…

MALICIOUS

PDF

44.5 KB Created: 2020-11-09 15:00:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-11
MD5: efc3d27b42dcaf2fa6af008899937348 SHA-1: a1f6240a28e753863480567881f6e5f9e4dc3dd1 SHA-256: b6253379b334bd1cdec0e1ded034d71455f8676504a72070e94f23e7c676bffe
194 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.
  • 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.
  • 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/aws?keyword=5th+grade+writing+prompts+with+articles In PDF document text
    • https://cdn-cms.f-static.net/uploads/4403264/normal_5f923598adc73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451551/normal_5fa3cf210127f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455642/normal_5fa57d09b23c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425256/normal_5fa39e533e4a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365660/normal_5f8a476fa8bee.pdfIn PDF document text
    • https://nikoxutaju.weebly.com/uploads/1/3/1/3/131378952/ruxiboxitozopakoton.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366369/normal_5f9c6c6da9757.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377909/normal_5f8a004d7464b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387581/normal_5f938baf919aa.pdfIn PDF document text
    • https://suvenalopevoku.weebly.com/uploads/1/3/4/5/134510495/bisagatib_sigozak_zonawo.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/1981c63a-4aa0-40eb-a001-4b07620a22ce/nivufuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43a8493e-499a-4d60-adba-05f428ffe91f/70352664043.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CE2 6812 bytes
SHA-256: a34b840e6e726380c84f4f3a148208c6ea30fbf11d32fd72c0113864af826204
font_01_sfnt_off00006e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E17 5608 bytes
SHA-256: 540657c6814af2ff83ca715c637030e29ad67c58a0b1f898266f6291f0bb6fa5
font_02_sfnt_off00008111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8111 10744 bytes
SHA-256: a69d6e8d2928644099e3f569ac3902b983b6e550be8541d837fb4d5df0f506ed

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