Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7717e070c9b85fa…

MALICIOUS

PDF

38.5 KB Created: 2020-09-18 23:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2588674a2c4ca3a44b12c5e6008dc5f7 SHA-1: 8c4abfded2e2e25b9aa4453785f694b288c2648c SHA-256: f7717e070c9b85faa63defaa065ad5cd785f23e7f6eac6aa841bf3f41681f0a1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.link/wix?keyword=the+crucial+worksheet+on+imagery+answer+key'. This URL is presented within the document body, suggesting a social engineering lure to trick users into clicking it. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy, likely to improve search engine ranking for malicious content. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.link/wix?keyword=the+crucible+worksheet+on+imagery+answer+key
    • https://cdn.shopify.com/s/files/1/0434/5279/2982/files/9827963228.pdf
    • https://cdn.shopify.com/s/files/1/0462/5507/9573/files/kefebub.pdf
    • https://cdn.shopify.com/s/files/1/0431/1446/3386/files/chinese_series_website.pdf
    • https://cdn.shopify.com/s/files/1/0435/4909/8148/files/dadegakoz.pdf
    • https://cdn.shopify.com/s/files/1/0438/1714/0386/files/discord_chat_rooms.pdf
    • https://cdn.shopify.com/s/files/1/0432/1561/8203/files/renojisemamuka.pdf
    • https://cdn.shopify.com/s/files/1/0431/6450/0122/files/76551640989.pdf
    • https://cdn.shopify.com/s/files/1/0435/3648/2458/files/bosch_dishwasher_800_series_installation_manual.pdf
    • https://b923a807-3398-44a8-891a-9662171011a6.filesusr.com/ugd/7b00a0_198af6e15b7744748411125b4fda839f.pdf?index=true
    • https://c48c0b68-9f75-43b2-9b26-4246f7906335.filesusr.com/ugd/c63bf9_838f8d6c78b744b78c214b4642a3de97.pdf?index=true
    • https://f1d38a54-78ec-4131-ba11-f5d60c5bf8b5.filesusr.com/ugd/d1c05f_cae09db5494943d8b1d2e0d7f2f193d8.pdf?index=true
    • https://94ffbe78-c501-4cc0-b66f-3dc7cef3bd81.filesusr.com/ugd/10b11f_7fcb5de6bc464420901c87d45d81cf04.pdf?index=true
    • https://eb295520-c40f-4906-b39c-4f519d284d35.filesusr.com/ugd/70094d_981cc225b4dc4a28b4444a839dbcdb6c.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0447/4670/2999/files/a_tryst_with_destiny_speech.pdf
    • https://cdn.shopify.com/s/files/1/0438/3080/4642/files/cara_install_android_studio_dan_jdk.pdf
    • https://cdn.shopify.com/s/files/1/0432/1850/1799/files/26021889917.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005907.bin
2acce6630ac891cd152bc1d89b4f4c0b6d91b1e18f78bef4a5744898be001112		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5907 5560 bytes
font_01_sfnt_off00006bdb.bin
3a2c786617113c06c45770e197bf73af85a08bf634f59dae8c1037ba883e67e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BDB 9692 bytes

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