Malicious PDF — malware analysis report

Static analysis result for SHA-256 901fb070e9c0c478…

MALICIOUS

PDF

36.9 KB Created: 2020-08-06 06:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: e2eb6f1f8bf1133257858968d1ac55dc SHA-1: e4c419f1f066ab307533342554a414fc618c8e86 SHA-256: 901fb070e9c0c478a9722702d6c7481c3858a7a6a09b21ab8e8162c8899751ce
194 Risk Score

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://ttraff.com/pify?keyword=functional+analysis+notes+pdf In PDF document text
    • http://files.turboproductsusa.com/uploads/1/3/1/8/131856392/5063092.pdfIn PDF document text
    • http://files.heritageelementarypto.org/uploads/1/3/1/6/131606431/rujababadef.pdfIn PDF document text
    • http://files.tributegiftsgp.com/uploads/1/3/1/4/131437149/kovalaxewubipizenete.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/1/0428/1673/3340/files/10090545786.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37872338034.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/0081/2952/files/nepevatunexagar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1533/1227/files/24025046657.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6158/9669/files/27128261627.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9793/9361/files/89322354269.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3330/3976/files/fovugixa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6472/9512/files/xadiwimexomanemixigewini.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2358/0830/files/86076638803.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8624/0162/files/ximotekeliresal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8866/7034/files/28049827150.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2381/9164/files/restaurant_business_plan_presentation.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0504/1051/files/59007800670.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3136/2725/files/79267846130.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_off000054aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x54AA 5112 bytes
SHA-256: 86db89bd8aa6b064626c64bc66cf66f5d938a69e5db07e2d32efacba3b045b0c
font_01_sfnt_off00006634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6634 9580 bytes
SHA-256: c249e49cf0eb2a85f41fe8f62639b33774c5c815b30343d1c1e61cd20f0dcbe4

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