Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cbf08f61fc4acea…

MALICIOUS

PDF

39.8 KB Created: 2020-09-10 04:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 60e1a150cadace4e7b83a1621097e49b SHA-1: c4aec4244432bee9bc5de1023272077d2536e730 SHA-256: 0cbf08f61fc4acea12ac0d8dfa5f353dc575ab475e92703a9fb63d14728c0911
202 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.link/pify?keyword=film+bioskop+komedi+indonesia+lk21 In PDF document text
    • http://files.gnvtoxsquad.com/uploads/1/3/0/7/130738836/3938633.pdfIn PDF document text
    • http://files.bestcarpetcleaningdavenport.com/uploads/1/3/2/6/132682723/xoxipot.pdfIn PDF document text
    • http://files.madlyeclectic.com/uploads/1/3/1/4/131483253/nuwitoduku_xafozovininu_lekilirox_navagad.pdfIn PDF document text
    • http://dagesuxu.goshenmechanical.com/uploads/1/3/1/4/131437299/pofiforapezemomago.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/1/0430/3778/6266/files/html_tags_with_attributes_and_examples.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6863/6834/files/49008149688.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7142/9021/files/nyc_subway_map_2018.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rapuz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3730/2685/files/zunaxora.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7772/9430/files/trastornos_alimenticios_en_adolescentes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4859/8678/files/40182145992.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2534/8261/files/free_golf_tournament_flyer_template_publisher.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/deved.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5534/1977/files/barnes_and_noble_application_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/91960476686.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_off00005da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DA6 5352 bytes
SHA-256: fe90f3ff049d7f33b571909a3d4b0a5256d24de22d983397abf9a4e13218ecd6
font_01_sfnt_off00006fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FC7 10128 bytes
SHA-256: 2f3bba7c9bcecc8b184a61d1a1feff8edc4f0769eeb8d47063ba7f44cd5779a4

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