Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6decd6f0e86e211…

MALICIOUS

PDF

41.1 KB Created: 2020-10-30 04:24:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: bd7c4ff21b778bf8a54896cd7e83d20b SHA-1: e718b82b6878f255cfbc9c7252a430db4bd7ca59 SHA-256: a6decd6f0e86e2118d9bafe7af7d93fda40e28ebb2105560a4fbd16da9783cbb
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://ttraff.me/123?keyword=process+dynamics+and+control+pdf In PDF document text
    • https://melegejisud.weebly.com/uploads/1/3/1/3/131379421/5630034.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/aeb4607a-e7b6-41e1-809b-f8b4ce8effd3/13243282365.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b06ee874-2798-4a09-a89a-bb7375671be3/2921442327.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f2fe40f-4123-4b6b-a5bf-ef198c6ab04c/31600720500.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7100/5082/files/43269234438.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ed043e1-7dcb-438c-a484-72bdfb24cd36/jibopazizifobu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/2969/1066/files/zuwugiruzolimewatilifun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32ff4960-81a1-4787-a978-dee7a0cc5b43/34405983839.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b0886eb-7447-4dc9-8e76-5b001054f0ef/1974_vw_beetle_repair_manual_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/7771/2068/files/download_unified_remote_full_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00c80db4-374c-4b61-bb31-0ff041808eed/socom_u._s._navy_seals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/581f7fa8-40d8-4b62-9415-741fc6dd1b43/10486830324.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb98e634-9639-4bae-8dbd-10ea70587601/transformational_leadership_style_pr.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_off000061e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61E8 5404 bytes
SHA-256: cc6f08db7317a533419cb648da162079a8e4c4f96bebc8f50d9ade0f98bf51e9
font_01_sfnt_off0000743c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x743C 10532 bytes
SHA-256: 077a177fed42a2ec9eb3b5642a6459200d8d5cff83bac9d464d725885fe8a10d

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