Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf6427222f48c6b…

MALICIOUS

PDF

56.6 KB Created: 2020-09-20 10:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 700096db9a33de4e86914f413c4ac8a1 SHA-1: 2d5cf1953800532aac3fb99ad7576a09feeb3003 SHA-256: 4bf6427222f48c6bc3b57db788de7c4b0bdc3c34cf3127f17030eb5488274ab3
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://ttraff.ru/wix?keyword=tv+guide+listings+savannah+ga In PDF document text
    • http://files.theaterinthepark.net/uploads/1/3/1/4/131437722/9126638.pdfIn PDF document text
    • http://files.mustangremediation.com/uploads/1/3/1/4/131453588/9744949.pdfIn PDF document text
    • http://zunoju.artytypesartschool.com/uploads/1/3/1/3/131398591/viwokovofobabi.pdfIn PDF document text
    • http://files.gabiroach.com/uploads/1/3/2/7/132741149/pobajopobepobod.pdfIn PDF document text
    • http://files.gefyrathebridge.com/uploads/1/3/1/3/131397971/2c6e21d0f430.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/1/0431/9916/8673/files/672066404.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5144/1560/files/sutifinekugixekovoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7265/1413/files/beiimaan_love_full_movie_free_480p.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8198/2361/files/economic_zoology_shukla_upadhyay.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1637/9816/files/66555457535.pdfIn PDF document text
    • https://cbabcf4e-f869-46ab-b623-791886c425c1.filesusr.com/ugd/595093_0d11a334b4124ff6aa31f58956b3c806.pdf?index=trueIn PDF document text
    • https://730b786e-c45e-44bc-a87f-9d6f215fce6e.filesusr.com/ugd/e4a001_9af2c863b666468f922e88ae1f39060f.pdf?index=trueIn PDF document text
    • https://281cc622-5aa1-47a6-89c9-362572638fab.filesusr.com/ugd/83d902_56a8ffb52e9b4d2c9c4a4a4614dfbd6b.pdf?index=trueIn PDF document text
    • https://31f0494e-c1d0-4a91-bade-fb9738e12c5c.filesusr.com/ugd/e49726_9111b741dfab49c98a9b124c4aeffe8b.pdf?index=trueIn PDF document text
    • https://12fc2271-960d-4015-a57d-80229a8b369c.filesusr.com/ugd/80bfa9_37607e2e982c447fb282ff83630a9f8b.pdf?index=trueIn PDF document text
    • https://b2c6e71a-3a13-4204-bfa6-397e8662a24d.filesusr.com/ugd/d4579c_e5a71bcbfd744f9288492671671ca758.pdf?index=trueIn PDF document text
    • https://25ca4f77-0e96-46d5-be0b-39fbb6652950.filesusr.com/ugd/5bf82b_17135ede2fce41f1b3a754bed5804f36.pdf?index=trueIn PDF document text
    • https://3b9fecb5-ea91-45b1-9da5-cd3b3b7c2879.filesusr.com/ugd/eb4c03_5010708b167341a4af5fa485eeef1011.pdf?index=trueIn PDF document text
    • https://0f4d65e7-f015-4949-a09a-5f3d5ff46109.filesusr.com/ugd/7baf93_c67852c17b7c403db87c454c24752580.pdf?index=trueIn 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_off00009e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E8D 5000 bytes
SHA-256: e4321625883948d23e8ec0e238add77e91e2916805b11afff5c24fcebe05b8f3
font_01_sfnt_off0000af95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF95 10984 bytes
SHA-256: ab4aaf96fe9d1eac9dafcd40b95cffe93ba585e9a25c7e7fc5f7500d7f82f626

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