Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a1001db3bf7581…

MALICIOUS

PDF

38.1 KB Created: 2020-10-07 12:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 8882cb0be781fb3bba76b01e39c95ffe SHA-1: 940f9f02c4b654dfe87c50b2ba92b33e12fee94f SHA-256: a4a1001db3bf7581dbd5de99f1897419054c8ebadbc63363c3fb0d9ee70f0836
154 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.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://ggtraff.ru/strik?keyword=va+la+jolla+pharmacy In PDF document text
    • http://files.samalaghoshcreations.com/uploads/1/3/0/8/130813496/puvujudoni-xogitufujalim.pdfIn PDF document text
    • http://pudulezuj.graphiclibrary.org/uploads/1/3/1/4/131437318/mevujodufilew_sefevuno_bosubunulun.pdfIn PDF document text
    • http://files.batteryconservancy.org/uploads/1/3/0/7/130775180/375309ee.pdfIn PDF document text
    • http://nomavo.candcauction.org/uploads/1/3/0/7/130775940/addedc317.pdfIn PDF document text
    • http://bagoja.queenofthewaves.org/uploads/1/3/0/8/130814328/1079946.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5509/9287/files/502953113.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6640/1692/files/21291446639.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6904/6935/files/save_google_docs_to_desktop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/1108/8799/files/goanimate_comedy_world_backgrounds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04752193-e1ac-44af-a4c8-33f27fee3934/kibemazojudifurevejuwowa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5be8ea8c-41b5-4538-9d82-2dda6b29676f/83904148593.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_off00004daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4DAF 5136 bytes
SHA-256: c3de389fcfb56c1f7ce8fa7ebbde9d674d06fcd1410cf32e26a7a57a59a93fea
font_01_sfnt_off00005f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F0E 14564 bytes
SHA-256: fc82ea0a2fa4da3560b2ce3e74564f91a52ed375d644c964fba5fd7625191a0e