Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bcbbb20208a3dd8…

MALICIOUS

PDF

42.8 KB Created: 2020-11-08 04:20:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 427169835d0fc0b42558d3b2f0c5757d SHA-1: e91f7782d27572cdc3c83b078b24afa78c98ca45 SHA-256: 8bcbbb20208a3dd806b0528479612ea9af7da73b2e3981b9d98954fb293ae744
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffe.ru/aws?keyword=write+a+letter+to+santa+for+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366014/normal_5f96556b02942.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368485/normal_5f8c7f9eae5b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459059/normal_5fa17ea8e590d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369762/normal_5f92d04cc30d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387031/normal_5fa4c782105e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391317/normal_5f9cec1373efd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385012/normal_5f93a2b009e79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367665/normal_5f88a58dd3f2e.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/damerirazib/tebovadereba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f2a24b8-0dea-4d02-86f8-b6a0cfa255e1/52256908165.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8001de3d-d8ae-4a87-a261-35d268a44870/porter_cable_scroll_saw_insert.pdfIn PDF document text
    • https://rijaboxato.files.wordpress.com/2020/11/la_psicologia_del_exito_mario_luna_audiolibro.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/adap_study_guide_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/i_keep_it_taco_jhin_guide.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_off00006bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BDB 4772 bytes
SHA-256: a605f32f7c0664ae0534c65c3008e708a9066516b5bd5da91fb8b562d7017d6f
font_01_sfnt_off00007c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C30 10120 bytes
SHA-256: e857fbc822ce2f217ae65be37d8ad9698bb13553293c3bd4a54e2a028877edf3