Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f91355c0c71489e…

MALICIOUS

PDF

45.4 KB Created: 2020-07-31 08:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 8b7db631543dae27466806949b20b312 SHA-1: 07bfbd24875b1ad14bbb019148bf1ea5bdf39dfc SHA-256: 4f91355c0c71489e866721e98c7b5cc2e8259d10d4ab7d66d66043fff32360f5
234 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://ttraff.com/pify?keyword=algorithms+4th+edition+by+robert+sedgewick+pdf In PDF document text
    • http://files.gratefulgathers.com/uploads/1/3/0/7/130776371/4629414.pdfIn PDF document text
    • http://files.reaassociates-blog.com/uploads/1/3/2/6/132695530/0d01e329b7cf973.pdfIn PDF document text
    • http://files.affordableweddingvideos.net/uploads/1/3/0/8/130814387/fb96d05a73a.pdfIn PDF document text
    • http://files.minlatonchocolaterie.com/uploads/1/3/0/7/130738562/1174850.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/1/0431/5054/0964/files/xetitegireko.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2497/1936/files/41212801764.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1267/5990/files/tuziwuruxenulo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4572/5094/files/kufaxebedubo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0373/9294/files/palijoku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3173/2122/files/fevefadixatinupekiruk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6563/9069/files/6619468892.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9658/1020/files/sexevubemisewipijotubu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5923/3443/files/2688698063.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6204/2532/files/lafugijeranew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5896/1315/files/dewomotekawa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9915/2799/files/nofemakidedajaloxo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1185/0918/files/48041075079.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_off000071fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71FA 5620 bytes
SHA-256: af02d8107acaec49717405b4248de3b35411acaa22bcae16741eefd827d1a03b
font_01_sfnt_off00008508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8508 10196 bytes
SHA-256: 71e9ba3a4afa710f525891351c9df48071d425600c2b8f0bac31b8e637bcbe5e

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