Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba6f669568d7011…

MALICIOUS

PDF

147.9 KB Created: 2020-10-26 22:33:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 46164025748a7d32a7f0562df4ac8ccf SHA-1: 8f3de5f78d693dec85989393523bb0406f7f1930 SHA-256: 4ba6f669568d7011fa127f4b6490d54ae11c932e3cc91be20f6cf6ede7820553
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, identified by the heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK'. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The ML classifier also strongly flagged this PDF as malicious. The presence of embedded URLs and the nature of the heuristics indicate a phishing or scam attempt, likely delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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=ny+knicks+retired+numbers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366366/normal_5f8737d7d9f3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368788/normal_5f87a6ae972ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415950/normal_5f959311a7873.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380073/normal_5f8fff20880f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373297/normal_5f8f3f2037b2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366341/normal_5f8fe9f3cebec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369802/normal_5f88289415ff4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387036/normal_5f93e4be4a07b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366305/normal_5f963a6398cd7.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/1/0461/3170/8072/files/42887234221.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8924/8924/files/popumimajevogatukorasifuf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5650/4744/files/eton_frx3_instructions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6698/5122/files/vufotakizo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/2167/9771/files/jumia_online_shopping_app_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/0672/3749/files/zippo_hand_warmer_replacement_burner.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8846/1478/files/lg_steam_washer_manual_wm2487hrma.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0002/0130/files/tofuwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ae6d728-c022-4f10-9ce0-7c54b194a8ea/oracion_rey_salomon_dominador.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6570415f-26ac-488f-801c-39d88c3dc163/56296864910.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/ayat_surah_ruqyah.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/ielts_speaking_topics_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/accuracy_and_precision_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/26678021980.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_off000206ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x206AC 5120 bytes
SHA-256: 81719ae5739dc2785658ace2563e5d94a5492e90758bd89a982ed7eb88369ab8
font_01_sfnt_off00021800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21800 12940 bytes
SHA-256: 380a913aa0f655c7591405a2fa26e8cb21f515538fa70239661ac6aa6cb4b623