Malicious PDF — malware analysis report

Static analysis result for SHA-256 4139777c243544a7…

MALICIOUS

PDF

54.4 KB Created: 2020-10-25 14:30:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: dfa160089e887343ff3a183569102ab0 SHA-1: 6e88108393603eeec1f84b133dd632790e9dc27a SHA-256: 4139777c243544a7638ee3897a43ced436ad7c298fa5e826b18709781d70148b
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/strik?keyword=ptcb+study+guide+2018+pdf+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366384/normal_5f87232b2fc2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375200/normal_5f8b1e2f6dc61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367680/normal_5f910fba88b8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370307/normal_5f95364aebfcd.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off000083ef.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off000083ef.bin)
    • http://www.daltonmaag.com/In extracted file (font_02_sfnt_off0000bc7b.bin)
    • https://cdn.shopify.com/s/files/1/0266/8599/7234/files/xukamaxane.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/4473/2833/files/duxigupixedid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/1464/1605/files/new_racing_games_2020_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/3882/4377/files/paruvalerupubuzuxosopolox.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/tobuwolebidelutopuline.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/2829321469.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/dixutoxesujegame.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/61162502025.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/bosujezupajapupenavoxur.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/depipedoni.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3071/5288/files/zemurewovis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/3897/3345/files/27641443457.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4511/7342/files/algebra_2_chapter_5_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0508/3716/0101/files/58482621378.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4673/1930/files/streamlabs_chatbot_song_request_commands.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/54488432630.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/98983937717.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 extracted file (font_00_sfnt_off000083ef.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000083ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83EF 5512 bytes
SHA-256: f162ab53636252b945cf1f1fdf758d8b077a480a3c350e77237ce85980de4e40
font_01_sfnt_off000096ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96CA 11092 bytes
SHA-256: e72f5c117bbf15f02e3a37320d557ff8d1b2b2f3eb670553f0a7d008fabbfddf
font_02_sfnt_off0000bc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC7B 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176