Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c8cecf893b35ed…

MALICIOUS

PDF

42.1 KB Created: 2020-10-07 14:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 8ff5abe568eb8c8457fc6098f44a73b9 SHA-1: e3e2710ce098adc72002aaa0bb129c7ec1f26c42 SHA-256: f8c8cecf893b35ed7e7318bb1007d396a28b47f073fa0be907bd4c20e16c1713
202 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=imovie+apk+download+free+for+android In PDF document text
    • http://files.prestonphotographicsociety.org/uploads/1/3/1/6/131606687/bokedelikiwusaw.pdfIn PDF document text
    • http://files.psweloveu.com/uploads/1/3/2/3/132303329/fumafo-lagogusepebeb-fidugew.pdfIn PDF document text
    • http://files.teamcenterinc.com/uploads/1/3/1/8/131856991/wewawufilidutowagax.pdfIn PDF document text
    • http://files.mannahomesne.com/uploads/1/3/1/3/131383297/wenilem_bumilejabo_furotuje_gokakaxumezuz.pdfIn PDF document text
    • https://site-1038376.mozfiles.com/files/1038376/xajaboropusotolobul.pdfIn PDF document text
    • https://site-1039840.mozfiles.com/files/1039840/4178542922.pdfIn PDF document text
    • https://site-1036834.mozfiles.com/files/1036834/12899742346.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/1/0488/2612/2405/files/go_math_grade_4_chapter_7_review_test_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8733/4038/files/carbon_copy_paper_staples.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1773/2249/files/world_tapping_circle.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5747/8809/files/mapoxerikozijavufineg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0341/5208/files/virtual_reality_camera_apk.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_off0000669d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x669D 5164 bytes
SHA-256: ad211d84939d4e50398e48aadd833a9221109d08444f7694298e2c286fdbf801
font_01_sfnt_off00007832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7832 10420 bytes
SHA-256: 878328ed9c4f29adf8e7f1ff14bec308fc075fe28da2c68619a500fb60379c7a

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