Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d59a55be1438f3…

MALICIOUS

PDF

52.8 KB Created: 2020-10-15 22:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 42c4da7bd8df851c698f58572207b755 SHA-1: c50504e56d3cf9d94fe8b67e001b8a5b3fbfa446 SHA-256: 83d59a55be1438f3e5e71f40477546d8eebeef48a761acc354b645ccfb717311
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://gettraff.ru/123?keyword=protein+metabolism+summary+pdf In PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/lanadez.pdfIn PDF document text
    • https://jemiwuwavaza.weebly.com/uploads/1/3/0/8/130814288/bibesekukemugedovofa.pdfIn PDF document text
    • https://site-1039800.mozfiles.com/files/1039800/81482368832.pdfIn PDF document text
    • https://site-1043937.mozfiles.com/files/1043937/kisatuwuzulakuvil.pdfIn PDF document text
    • https://site-1037881.mozfiles.com/files/1037881/11301559968.pdfIn PDF document text
    • https://site-1041579.mozfiles.com/files/1041579/3888823630.pdfIn PDF document text
    • https://site-1039566.mozfiles.com/files/1039566/gedexamuwivij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365998/normal_5f889b6491048.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367633/normal_5f87632c10bce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366045/normal_5f870630cacf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368235/normal_5f882ec40f3a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366305/normal_5f8839aeedd29.pdfIn PDF document text
    • https://site-1036737.mozfiles.com/files/1036737/petolapofujidixelubud.pdfIn PDF document text
    • https://site-1039289.mozfiles.com/files/1039289/bloodborne_trophy_guide_in_order.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0495/5157/3144/files/feudalism_3_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/1914/3834/files/skyrim_se_bodyslide_presets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4784/4000/files/40895068816.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/2098/4735/files/abc_warehouse_black_friday.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3565/8906/files/hydro_mousse_liquid_lawn_reviews.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000081d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81D7 5312 bytes
SHA-256: a608b4c8cdd2b4cbcb3983426718c23556968fa0c5ab08a52a279ffd5fbbb0bf
font_01_sfnt_off000093bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93BF 10636 bytes
SHA-256: 307e194105c0a12f1a6a3491b5dda342003cb14fc74e4bc81258f21219718f76
font_02_sfnt_off0000b7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F7 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2