Malicious PDF — malware analysis report

Static analysis result for SHA-256 41b93c86d32b007e…

MALICIOUS

PDF

37.0 KB Created: 2020-10-03 00:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: ab53d1480e126bc489c390724c814437 SHA-1: e845c2a1aaaffcdf6e613957e13902bf5428ed76 SHA-256: 41b93c86d32b007e799f458028a3f619e346597d6e2e658fca09e80f71629d16
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://ggtraff.ru/strik?keyword=harper+biochemistry+pdf+free+downloa In PDF document text
    • http://files.randiandmike.com/uploads/1/3/2/6/132695472/felumozu_nanibugufe_fipojozar_vunibubikowek.pdfIn PDF document text
    • http://files.seergreensingers.com/uploads/1/3/2/7/132710491/37e965717e69.pdfIn PDF document text
    • http://tazejo.festoonlettering.com/uploads/1/3/0/9/130969140/liwukaro.pdfIn PDF document text
    • http://files.weednwenches.net/uploads/1/3/1/3/131380482/9657223.pdfIn PDF document text
    • https://site-1037228.mozfiles.com/files/1037228/kiledasugomiwiv.pdfIn PDF document text
    • https://site-1036640.mozfiles.com/files/1036640/69074703351.pdfIn PDF document text
    • https://site-1037164.mozfiles.com/files/1037164/75978501926.pdfIn PDF document text
    • https://site-1039280.mozfiles.com/files/1039280/91113930372.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/1/0484/0236/6632/files/strike_force_hero_3_hacked_unblocked.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/1680/0416/files/nordictrack_e5_si_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1414/4675/files/v_r_and_i_in_parallel_circuits_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6975/1967/files/oedipus_the_king_1968_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6463/1195/files/aspire_google_classroom.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_off0000513e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x513E 5688 bytes
SHA-256: 4f0ce77e9d0f4d5876f0be59fa0033f9e79d301755ee23417b8602baf9890956
font_01_sfnt_off0000647a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x647A 10128 bytes
SHA-256: cce3fef088bf5e2f369031bd972ac222cdcec76915894f0df281e98bcc0a44b9