Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a9d37c4b725de6b…

MALICIOUS

PDF

43.3 KB Created: 2020-09-09 14:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 1616ea8aef0aea6459c16b1fe215623d SHA-1: 2fc6e5e01f04699a1f033b28f5c1d947bc064e1e SHA-256: 2a9d37c4b725de6bc6ec13a12fd3239039779ce617d3deeee9bd769c8cc3059d
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.ru/wix?keyword=autosketch+full+version In PDF document text
    • http://zeduzu.debsbluemoonphotography.com/uploads/1/3/2/6/132681579/3221aaf8.pdfIn PDF document text
    • http://levanude.aquaclio.net/uploads/1/3/0/8/130814328/4749945.pdfIn PDF document text
    • http://files.coburnmountainatvriders.com/uploads/1/3/2/6/132696233/3701352.pdfIn PDF document text
    • http://wemapefok.thecartoonersstudio.com/uploads/1/3/1/3/131381428/8612809.pdfIn PDF document text
    • http://files.genesisoutdoorservices.com/uploads/1/3/1/4/131437615/3467b6c691.pdfIn PDF document text
    • http://files.summithilltopperfootball.com/uploads/1/3/1/3/131379134/ecf06f44f1.pdfIn PDF document text
    • http://files.techreviewed.xyz/uploads/1/3/1/3/131382700/ruxudefizor-juvadiwefidatot.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/1/0431/8163/7794/files/56803367370.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7020/0737/files/vulumuwumolirapazus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4627/2162/files/jowozedezizupuwefi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4397/0463/files/sasedax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2202/4867/files/converting_fahrenheit_to_celsius_answers.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/3e5d97_b106c2eb5ff24b76a1baa983328e5e08.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/4b68be_0bf861c3678c4790b0d90fec67df342f.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/ea78e0_90af6767048f4fd5917b98ad3cc46183.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/f17c08_bb7ade70777a4e3eb8b6ecb34b3a2758.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/0d089b_71058ca1abb14a1b8e7b120e8af6d918.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_off00006501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6501 4872 bytes
SHA-256: 5fb787f74320996e079fb6b858b4508701dfaadd800d2d34b30fdb8232403104
font_01_sfnt_off0000759f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x759F 13544 bytes
SHA-256: 71069013b4c747b9da29490fc08ff4d829dcb109184ce231dc6d15d3648baa0a

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