Malicious PDF — malware analysis report

Static analysis result for SHA-256 499c1f7886608af5…

MALICIOUS

PDF

45.5 KB Created: 2020-10-28 12:19:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: dc3ba52d5df46b5f7aade3e3599b0107 SHA-1: 8f1cd92a190e8e37d390a37f9a4bbd880bb1941d SHA-256: 499c1f7886608af54b8285b4b4153be2e90d204d20e36e829458b31f18336894
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/aws?keyword=most+expensive+gun In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369768/normal_5f8b0a0a3dd70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369332/normal_5f920c168c581.pdfIn PDF document text
    • https://gelekale.weebly.com/uploads/1/3/4/2/134266195/bb5a80fb.pdfIn PDF document text
    • https://xoraxabaxid.weebly.com/uploads/1/3/2/6/132682630/3816401.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367304/normal_5f93dd16d5802.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366623/normal_5f8cec360bc9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367624/normal_5f8d9f4de68f6.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off000074b0.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off000074b0.bin)
    • https://cdn.shopify.com/s/files/1/0463/0636/1504/files/education_law_3214.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd64e78a-49b1-48d1-8218-3aea82b7f2e4/robuwivezaneximebene.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8473/4883/files/data_warehouse_toolkit_kimball_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/3210/7937/files/confluent_kafka_definitive_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6190/3005/files/best_movie_download_app_for_android_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/9250/7301/files/muxubezobafi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/2549/9813/files/wifi_hack_apk_root.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aa4f097-2f6f-4a1b-8828-0e565e053881/xenusimizanifufuxur.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/35678630119.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/8978/8572/files/etapas_del_desarrollo_visual.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/7447368931.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/1384/8219/files/34627941884.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6134/4406/files/how_does_petruchio_tame_kate_essay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae0bd911-1ee9-4a7e-98d7-8ca2891b9dc8/vitirametezubum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0219/1269/files/excel_vba_print_range.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98c2deb2-d674-4067-b743-37f5303821da/dawup.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 extracted file (font_00_sfnt_off000074b0.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74B0 4780 bytes
SHA-256: 8e57e7e1996420b0dc6bdb0058ec44b70d0dc5a71213e75c72da7c501fb36676
font_01_sfnt_off0000852a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x852A 10416 bytes
SHA-256: cdb89a80fa1360eaefe27f8252b99370b41578d08c1dc4b42202bdd99e9fa8f4