Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a97871206f410b…

MALICIOUS

PDF

44.4 KB Created: 2020-10-05 19:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: a9a8a5d55d10e69d633f1dd2ea6dcaa5 SHA-1: 711e827b0074f01b864f2ac12394fbf736107cd8 SHA-256: 23a97871206f410b8376903e49d27c06681215da1d78fbeab6ccecd2513f7a58
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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.club/pify?keyword=car+ac+troubleshooting+guide+pdf In PDF document text
    • http://files.bostemp.us/uploads/1/3/1/1/131164079/4685491.pdfIn PDF document text
    • http://puwomi.theregoesjess.com/uploads/1/3/2/6/132682070/vekuwez_zisivapujo.pdfIn PDF document text
    • http://files.littlehouseinsouthwoods.com/uploads/1/3/1/1/131163854/dalikabetilagika.pdfIn PDF document text
    • http://modej.possibleframe.com/uploads/1/3/1/4/131453013/xuxorofisivowig-vexufupiwada-bopopejumivo.pdfIn PDF document text
    • http://muwadaso.taylormorrismusic.com/uploads/1/3/2/6/132682883/xedavunazometalipa.pdfIn PDF document text
    • https://site-1037018.mozfiles.com/files/1037018/jekemijibogubevubarabo.pdfIn PDF document text
    • https://site-1038725.mozfiles.com/files/1038725/30429596054.pdfIn PDF document text
    • https://site-1036823.mozfiles.com/files/1036823/25493320777.pdfIn PDF document text
    • https://site-1039897.mozfiles.com/files/1039897/bifanonuzivupofup.pdfIn PDF document text
    • https://site-1037844.mozfiles.com/files/1037844/8633682447.pdfIn PDF document text
    • https://site-1039895.mozfiles.com/files/1039895/lutetadudolixavimupuriweg.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/1/0491/8833/9878/files/5573820991.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/5720/4378/files/richard_wright_the_man_who_was_almost_a_man.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8353/9366/files/99001649994.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9297/4499/files/rotulopedimuji.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_off00006df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DF9 5464 bytes
SHA-256: 381348fb4bc59d66c01c295b60f4f5fa030558ce3c0b69d8b1b415c3389ce708
font_01_sfnt_off0000807c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x807C 10728 bytes
SHA-256: fdbbce3cc7ed9de67c21e7f2ae651a4ab707c40095f4c5780cc90b9aabb9fb12

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