Malicious PDF — malware analysis report

Static analysis result for SHA-256 43d3d91cf8ca2b30…

MALICIOUS

PDF

48.2 KB Created: 2020-10-05 22:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 75887446d22b365db4c01ed51ddd9edd SHA-1: e4cdc0e06705a3c95adaa9a79e27f2f99250bf7d SHA-256: 43d3d91cf8ca2b30c955bbfb973bd35df33ab3db228306e64dfb8decbdd6530e
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=daddy+as+an+autobiographical+poem+pdf In PDF document text
    • http://buroxub.adamflemmingdesign.com/uploads/1/3/1/4/131412955/4a06b59.pdfIn PDF document text
    • http://gegerurak.daultkait.org/uploads/1/3/1/4/131452869/belisamagive-gavarikujijusis.pdfIn PDF document text
    • http://ludabur.alphaeta42.com/uploads/1/3/0/7/130740572/3511548.pdfIn PDF document text
    • http://files.anjisart.com/uploads/1/3/1/4/131453871/7936305.pdfIn PDF document text
    • https://site-1043357.mozfiles.com/files/1043357/9909654454.pdfIn PDF document text
    • https://site-1038765.mozfiles.com/files/1038765/27697381103.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/1/0430/6652/3809/files/warframe_law_of_retribution_guide_2017.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3817/0523/files/72742609867.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8425/3857/files/toy_story_woody_doll_original.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/3263/0680/files/tales_of_vesperia_necropolis_of_nostalgia_save_points.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6587/9965/files/correct_plural_of_hypothesis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/3126/5948/files/spam_bot_download_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2694/8001/files/peloreduridil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2656/5285/files/the_night_i_was_nobody_wideman_summary.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2434/1400/files/the_impossible_quiz_walkthrough_24.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_off00007e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E58 5808 bytes
SHA-256: 585fb5f6eb3d4dde8e71d3ee4a509c86e308a07f48859b76ebb562eb29193627
font_01_sfnt_off00009201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9201 9940 bytes
SHA-256: 3e802526caab9a5bc44af20a1d1c921b7e93dd2ae70e10daf0995d87f6aa1fd8

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