Malicious PDF — malware analysis report

Static analysis result for SHA-256 0976432d52b7b5a3…

MALICIOUS

PDF

41.3 KB Created: 2020-08-13 23:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b2ffe2fc11afa30c36835329fba7c9be SHA-1: 85c2d6f200a44062720463786f544d8dc61121b9 SHA-256: 0976432d52b7b5a31a20d67b6e782caaccfbc62d13ae838616dd26046c2e75d1
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting an application form lure, and the presence of many external PDF links indicates a link farm designed to distribute malicious content. 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.
  • 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.ru/pify?keyword=dtu+b+tech+application+form+2019
    • http://files.empirephilippines.com/uploads/1/3/1/3/131380786/3003ae6a76d9.pdf
    • http://files.northliverpoolteachingschool.org/uploads/1/3/1/3/131384638/jorowilojefiwe-xizefakutopo-vasatelekovi-jonusam.pdf
    • http://files.moriahmylod.com/uploads/1/3/1/1/131164157/dopad.pdf
    • http://files.fibro180.com/uploads/1/3/2/6/132681884/1112099.pdf
    • http://files.phillibertplantnursery.com/uploads/1/3/0/7/130775027/roxolavowamodalot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0212/5733/files/65879442933.pdf
    • https://cdn.shopify.com/s/files/1/0437/8581/4177/files/waguwuvogufujewizagetaw.pdf
    • https://cdn.shopify.com/s/files/1/0435/7767/1843/files/91071542471.pdf
    • https://cdn.shopify.com/s/files/1/0432/9055/8622/files/23961438468.pdf
    • https://cdn.shopify.com/s/files/1/0433/4164/3928/files/81302298061.pdf
    • https://cdn.shopify.com/s/files/1/0430/7012/8277/files/ditagi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4168/5665/files/kogidozovodi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5018/0503/files/angularjs_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/4541/9173/files/billy_joel_keyboard_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/0655/8359/files/sopazotevanibel.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c3e.bin
a1e38997bdd18987480225ab984f7fe29583bc3752724a0acd362812a9fa88f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C3E 5696 bytes
font_01_sfnt_off00006f77.bin
94c712afd012367ab6ab7fa796aa8c4db3efbfc4cf375e9e553cfa3c4c5a0f8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F77 12804 bytes

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