Malicious PDF — malware analysis report

Static analysis result for SHA-256 b763bb8dfc0f2870…

MALICIOUS

PDF

43.0 KB Created: 2020-10-02 21:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 8b0ea797b7cda5342d302435bbe70c46 SHA-1: 34faf6d870f67541c92013991349c0f8aea0f819 SHA-256: b763bb8dfc0f2870ee88a3b8daa84b61843aa1fc81aad981ceae89063cafb83f
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/pify?keyword=brashier+middle+college+schedule In PDF document text
    • http://revujufu.animasriverdays.com/uploads/1/3/0/7/130776582/2771713.pdfIn PDF document text
    • http://kixux.visuallyaccessiblecities.ca/uploads/1/3/1/4/131406286/nowal-nigete.pdfIn PDF document text
    • http://kobipuka.architecture-walks-and-talks.net/uploads/1/3/1/1/131164250/04b335ee6f376a.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/1/0433/9708/7390/files/dr._gundrys_diet_evolution_turn_off_the_genes_that_are_killing_you_and_your_waistline.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4161/1159/files/creative_sketchbook_cover_ideas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7480/5148/files/golden_retriever_puppies_for_sale_200_arizona.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4488/1062/files/99243258178.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/4260/6751/files/d_major_scale_guitar_positions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2630/9535/files/regent_theater_los_angeles_box_office.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2359/7725/files/ribodezusanutumotuge.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0487/0976/3222/files/cleaning_vicks_humidifier_vul520w.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/8074/5629/files/ralph_smart_books_to_read.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5390/6080/files/country_living_grain_mill_accessories.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7495/3120/files/kumovekulipebokar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2630/3134/files/nise_control_systems_engineering_solution_manual.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_off00006986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6986 5400 bytes
SHA-256: 4e62fc79b1b41777f458fb5583bf2facc6e024716b8504b1919580cb36fbe1c6
font_01_sfnt_off00007bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BB6 10416 bytes
SHA-256: d8920089a07d70f5f88a88e7e0546329daec14fcd0a9b388b9d5c46101d78580

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