Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f6924c8cc0021a3…

MALICIOUS

PDF

55.8 KB Created: 2020-09-30 15:21:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: afd532abeead816ecb0226cac766acc1 SHA-1: be1170dc061339d149bc4d00c74fc4990d76cfbd SHA-256: 4f6924c8cc0021a3e84bbba66a8a4fb4f3e900728e5fb53c221f07a85db15564
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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://gettraff.ru/strik?keyword=cdc+immunization+chart+pdf In PDF document text
    • http://files.bookyouraudition.com/uploads/1/3/0/8/130874361/ganibifoxate.pdfIn PDF document text
    • http://tisezu.kathrynbelle.com/uploads/1/3/2/6/132682646/xadetofino-vekukolilari-veduburomowibuf.pdfIn PDF document text
    • http://files.homeorganic.com/uploads/1/3/0/8/130814858/vizedokanizu_doraxezadiga_neluli_lubiv.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/1/0431/8124/4577/files/81462295838.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mapitawaluzosamorexub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8774/1607/files/pijilukojin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d277303c-2208-4b09-99df-f9941a95aec3/juziralazibijeva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a8b3416-7fac-4fc3-89f9-00df63078e0a/wodukibexaxalobazobuvepek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aed48a5-1a6a-4e9a-bc61-9e87a3ce4c9b/67819153451.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8b7599e-3003-4249-98cd-49a344005a8d/getovawi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f54f6fe-f264-4870-b491-005a43a99a13/62274570872.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a697f6c-ac5b-4fe7-9bd0-44ddd3588f1a/9991353071.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_off0000966d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x966D 5140 bytes
SHA-256: 9cc612f51948761945ab591575c4dfdae833404edf7a95a628c5d44099f8c69f
font_01_sfnt_off0000a7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA7C2 13516 bytes
SHA-256: d3bf1a855868f89e96f235a1e1711d0491c1c13458b21a0edf51e453485cc553

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