Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8262497d91382a…

MALICIOUS

PDF

42.9 KB Created: 2020-10-26 07:05:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: af85edd36e4fdb8399ed139083ec81ba SHA-1: 2b66d7985a9483bc7bf6f60161c05e08721dfcf7 SHA-256: bc8262497d91382a171c922b175c4602961a759a57930302c2a4b88182e96edf
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=cnc+machine+pdf+free+download In PDF document text
    • https://xipunozelizu.weebly.com/uploads/1/3/1/3/131382486/teripex.pdfIn PDF document text
    • https://nudojafobedem.weebly.com/uploads/1/3/1/3/131379550/bovudefomuleb.pdfIn PDF document text
    • https://dopuxaponaxu.weebly.com/uploads/1/3/2/6/132695391/2ef23.pdfIn PDF document text
    • https://wunamixexot.weebly.com/uploads/1/3/4/4/134456109/vitolekame.pdfIn PDF document text
    • https://gefedotozowane.weebly.com/uploads/1/3/4/3/134395864/kupupi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368218/normal_5f8db5abb3784.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373271/normal_5f8991f883350.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00006759.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00006759.bin)
    • https://cdn.shopify.com/s/files/1/0429/8797/8913/files/spelling_words_for_1st_grade_worksheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/4353/2185/files/zuguwer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7182/3262/files/belozubewawopu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8256/6811/files/6753346642.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6108/3296/files/confidence_fitness_vibration_machine_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/6474/1026/files/3733008635.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/1432/9772/files/oj_microline_underfloor_heating_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5443/8846/files/nfs_most_wanted_cheats_android_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5664/3739/files/71337431341.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7483/7925/files/73868695554.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/wetewu.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/bidazisoxufeb.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/kasawunotunuz.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_off00006759.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6759 5212 bytes
SHA-256: 9f15613bea00ee44f11eccfcccf09a9a8ac018eb7651ca66352d4155b6649078
font_01_sfnt_off000078eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78EB 11076 bytes
SHA-256: fdd7df9cd26b5b355d69b5dfc1bae622b3410a5be70f84dbf4550ddbe6585f2e