Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c1771c0f2d60c8d…

MALICIOUS

PDF

43.1 KB Created: 2020-09-18 15:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4617e6a0c6843144d83e57b9130c052 SHA-1: fcf961e2d5b2d3076c42de50f30f9f1311644766 SHA-256: 0c1771c0f2d60c8db48c745d15313ebd71ea814452eba1d891f8c12d2163d944
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic identifying it as a PDF redirector link pointing to a malicious URL. Another critical heuristic indicates a PDF link farm, suggesting the document is designed to host many external links. The ML classifier strongly supports the malicious verdict. The primary malicious URL identified is https://ttraff.club/wix?keyword=sinusoidal+word+problems+with+answers.

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.club/wix?keyword=sinusoidal+word+problems+with+answers
    • http://files.krogstadconstruction.com/uploads/1/3/2/8/132814048/tozuzagakume_gomow_mepukapot_nogalufuga.pdf
    • http://files.aodex.net/uploads/1/3/1/4/131410158/xotawud.pdf
    • http://woxikiv.jewellerybyjody.com/uploads/1/3/1/3/131382257/pojibir_xituze.pdf
    • http://files.metoomining.com/uploads/1/3/0/8/130874394/6594878.pdf
    • http://vifugewe.dallasprepsmedia.com/uploads/1/3/0/7/130739063/8493107.pdf
    • http://ruloxi.bespoke-services.org/uploads/1/3/1/1/131163559/6ee18ba033d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2b292f59-e985-4b67-8625-8e15ff43a1c7.filesusr.com/ugd/ef0078_23ca1e73249f4511a170cbbd973f405e.pdf?index=true
    • https://f5c7240e-f48a-4c6d-a392-423142837a11.filesusr.com/ugd/49f5ef_5d204fead19543fb933c37f0d9c3d85f.pdf?index=true
    • https://aceb606a-7cbb-43e0-bc37-e1bcff9effd7.filesusr.com/ugd/739437_e4557db4a7d2411a9d11943ee52d7e97.pdf?index=true
    • https://624359eb-7557-4c2d-a42e-71c1fda64cb1.filesusr.com/ugd/07e02c_ba2c865aa40c474fbcdc83e9a674e34f.pdf?index=true
    • https://ebcb39e2-b2c8-4bdc-89d6-edaef38f246a.filesusr.com/ugd/544c7e_7eba23f9fd52491381b7d2f6d5a7b6e2.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0432/5061/4429/files/66054623691.pdf
    • https://cdn.shopify.com/s/files/1/0428/3380/5471/files/44857756576.pdf
    • https://cdn.shopify.com/s/files/1/0484/9552/6043/files/rufojonademazomila.pdf
    • https://cdn.shopify.com/s/files/1/0486/8544/9366/files/11002807491.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_off00006a69.bin
27e422a7881dddd970845db7632e515a42fb52e8b0894136d8074f140d795063		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A69 5536 bytes
font_01_sfnt_off00007d12.bin
b6199aafd87fcccc4a81198cbffdcf86b8d45ff4dd6966829cebe84eac8a4ec4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D12 10056 bytes

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