Malicious PDF — malware analysis report

Static analysis result for SHA-256 88740d8904a190a0…

MALICIOUS

PDF

39.1 KB Created: 2020-10-28 12:48:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: ad216090013184f365e0ae3a274d46ae SHA-1: 84111f29c92767d4f9f4e5badfcefb6b3aaebd18 SHA-256: 88740d8904a190a0adfc26d9421494d5ed705a5a9ee0548c599086223eabdb9e
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/123?keyword=axis+football+league+hacked+unblocked In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367640/normal_5f89966fcbfa0.pdfIn PDF document text
    • https://dajifavetesa.weebly.com/uploads/1/3/4/2/134234726/nejopozani-nokivusisel-vosagadez-xepewaveno.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404103/normal_5f98e5cfc3bd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367911/normal_5f87f5c492f36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384143/normal_5f8f1e768add2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383695/normal_5f9283ce454b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365539/normal_5f8aed42ae698.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365570/normal_5f873bdb240cb.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/tojopixifew-bibam-dujejano.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369174/normal_5f8d36ed8dace.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00005aab.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00005aab.bin)
    • https://s3.amazonaws.com/felasorarabipis/xalopidofulo.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/36196390180.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/21475376834.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/zariwovewiwivib.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/libekilatovilezoxoxosa.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/ffxiv_chocobo_racing_breeding_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e93efd7-0308-4363-8617-cbd911bfe1ef/xutigoramasurazuwitirag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/935f25fa-8fb1-4166-b705-04972eae1b2f/jununum.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/verbal_ability_for_cat_by_arun_sharma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dba5fe5-396b-486f-a2f5-77ade1455fdd/95209341996.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_off00005aab.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AAB 5448 bytes
SHA-256: 5d68ab24994516f8c0932860101bab89aba5a3a313b7a9a112ac1a3d69a94691
font_01_sfnt_off00006d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D39 10088 bytes
SHA-256: be177ee4249d65eceea8948f12c18381df63f2f252685ceb442bc0b8d5f51689