Malicious PDF — malware analysis report

Static analysis result for SHA-256 67d5b53aea07c6e6…

MALICIOUS

PDF

56.1 KB Created: 2020-09-18 09:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fafcb482370f77d0207a1467d076f8a SHA-1: 4ae4f959db7ec3f866f527321fbf33457d36477b SHA-256: 67d5b53aea07c6e6e048ac21c81561f6027da9977318df43a18c12f323fb06c6
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though partially garbled, includes the text 'Some days quotes' and a URL that aligns with the malicious redirector heuristic. The presence of a link farm suggests an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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=some+days+quotes
    • http://zizuf.cabads.net/uploads/1/3/1/0/131071181/kiwafaxanugepagik.pdf
    • http://files.abridgetoenglish.com/uploads/1/3/0/7/130740175/tijezejife.pdf
    • http://files.gaindetalks.com/uploads/1/3/0/8/130874629/dojoja-kefuzegomoli-wadab.pdf
    • http://tufefu.setgogym.co.uk/uploads/1/3/1/3/131379121/380208.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://259d4f1e-d336-4861-832b-fc15a12adda8.filesusr.com/ugd/3ed902_4388682250a84a05808882a979fa0acc.pdf?index=true
    • https://10cb24df-9730-4431-9546-6fb294bb40d2.filesusr.com/ugd/66f3f9_93e1fa69a179463b85076e145d8d93d9.pdf?index=true
    • https://8d7ef216-a0d7-45f5-9f1a-e0def7db7a4c.filesusr.com/ugd/fe0276_3fa0df6d5376402e805a471ccd202f2b.pdf?index=true
    • https://88590ed5-44a3-4641-9a4d-3b46e1a1c90a.filesusr.com/ugd/c63bf9_23f77eb880c3471693046f3f6a078e53.pdf?index=true
    • https://4009e31b-eab5-49f0-8232-12544d04561f.filesusr.com/ugd/89c6ad_2ab31a4bc09142c49519b7ca8540c16e.pdf?index=true
    • https://32ae7092-3237-4515-a755-450679e0726d.filesusr.com/ugd/64f9d2_ac0489743cad4f18bdccd6c8644107ec.pdf?index=true
    • https://fc5f7619-c96b-4d6b-b3c0-10c1f45d14de.filesusr.com/ugd/599026_18e08f5dfa6047bcb6b1bf79179c027a.pdf?index=true
    • https://c93bd3b5-a92a-4281-ac8d-919fa6ac8dea.filesusr.com/ugd/4fb05f_cf419a56bc4941bf9bda75413fede8a8.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0437/2040/9256/files/39388694359.pdf
    • https://cdn.shopify.com/s/files/1/0428/5012/3943/files/sample_business_plan_for_high_school_students.pdf
    • https://cdn.shopify.com/s/files/1/0429/0006/2371/files/north_yuba_river_fishing_report.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000a5dd.bin
8d429fa13d916bdf11edb84ca0ecdb990360c566d4490a4e606b54f0fc6175b4		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA5DD 25624 bytes
font_00_sfnt_off00007208.bin
fcf560725c02cab8baa9c5f47207f64a965dcc56990dc8d3bea8f6aa9f76ab29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7208 5176 bytes
font_01_sfnt_off00008393.bin
68df693b34ad67882c41b8edc0e63ad3d04ea78b70f816c7d7e0aeabcee4d122		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8393 9976 bytes

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