Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b5dbd80bf94f37…

MALICIOUS

PDF

51.5 KB Created: 2020-10-28 22:47:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 27285e17437afe3666a98129542db344 SHA-1: 3bc9926a842f78fd9dcf8c7eeea8bc20359230dc SHA-256: e4b5dbd80bf94f37754937305056f7c1073a527e1384afa325b6df214360b433
194 Risk Score

Malware Insights

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

The PDF file contains embedded links that redirect to known malicious infrastructure, specifically `https://cctraff.ru/aws?keyword=zen+and+the+art+of+motorcycle+maintenance+quotes+pdf`. This indicates a phishing or scam attempt, likely using the document as a lure for users to click the malicious link. The ML classifier also strongly flagged this PDF as malicious.

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/aws?keyword=zen+and+the+art+of+motorcycle+maintenance+quotes+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4386597/normal_5f999557869f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373776/normal_5f8c75f41aefb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/60a7e8a8-3da8-42a5-9701-49e3fd4025a9/godzilla_king_of_the_monsters_subtit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d18bdb8-d3f3-4db5-b396-201300de48bd/41198688850.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8901/6472/files/13064249094.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/6372/0119/files/legawuvusisevorujewaweb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3032/3095/files/fedijabomifulodunawuw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/2310/4669/files/74218301944.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1917/2000/files/admiral_washer_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/3561/4120/files/fowojixep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/7888/4759/files/50728928776.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4073/7957/files/county_cavan_ireland_surnames.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5417/7185/files/windwalker_monk_mythic_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8812/5857/files/three_forms_of_verb_chart.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9155/8551/files/whatsapp_transparan_terbaru_2020_apk_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3343/5029/files/nopuraxudujuvudodaxomax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dd4f186-4ec6-4691-9722-34648a739083/sonukinupome.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0601/6674/files/mapa_topografico_de_colombia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/5460/1654/files/95955253222.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/276fb412-c87f-4717-a283-c9c810234c44/dufasidar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4276/4962/files/brittany_zamora_instagram_pictures.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_off000088a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88A6 5580 bytes
SHA-256: f5e8ccb10f22cf66b7ddc9ff715500b0bfd31627bf7746fe823ef222fed4d0c8
font_01_sfnt_off00009b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B87 10648 bytes
SHA-256: b5e101579f5614d93933b728291eb5d1a462e99ec9f6d76c0e33b71758306225