Malicious PDF — malware analysis report

Static analysis result for SHA-256 b99e01a0897b8d97…

MALICIOUS

PDF

35.7 KB Created: 2020-08-14 03:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25d3118c45c706ff35ba06fd31c143f3 SHA-1: eb5178421620b5a5ca812b28fa3ac569d3639a0c SHA-256: b99e01a0897b8d977481c864b87819df575d073a4a43377381c8b5848bd7d733
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the primary malicious URL, suggesting the intent is to redirect the user to potentially harmful content under the guise of educational material. The presence of many Shopify-hosted PDFs indicates a link farm or SEO poisoning attempt.

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.com/wb?keyword=modal%20verbs%20worksheets%20intermediate%20pdf
    • http://files.markjacobsauthor.com/uploads/1/3/0/9/130969191/rojefekat_nujovati.pdf
    • http://files.kurtarnold.net/uploads/1/3/1/4/131406403/57625.pdf
    • http://xubamum.fitzwilliamquartet.com/uploads/1/3/1/6/131606577/razel_luwefe_zinubotasonul_gerisig.pdf
    • http://files.jenibrady.com/uploads/1/3/0/8/130874067/kirila_tisupabarutake_jofasaxoge_visumaximoret.pdf
    • http://files.ameliaguild.com/uploads/1/3/1/3/131398117/xeves.pdf
    • https://cdn.shopify.com/s/files/1/0439/4080/6824/files/39871851587.pdf
    • https://cdn.shopify.com/s/files/1/0436/9163/8934/files/mulazalixubukebuwafuwolak.pdf
    • https://cdn.shopify.com/s/files/1/0427/7701/8524/files/40394729474.pdf
    • https://cdn.shopify.com/s/files/1/0434/3929/2577/files/bitcoin_trading_platform_github.pdf
    • https://cdn.shopify.com/s/files/1/0437/2047/4779/files/28649006677.pdf
    • https://cdn.shopify.com/s/files/1/0433/2421/1354/files/aplikasi_blade_sword_of_elysion.pdf
    • https://cdn.shopify.com/s/files/1/0433/4069/3662/files/update-_rc._d.pdf
    • https://cdn.shopify.com/s/files/1/0432/7571/4715/files/1394222017.pdf
    • https://cdn.shopify.com/s/files/1/0433/9066/4860/files/vivapudero.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/68905528383.pdf
    • https://cdn.shopify.com/s/files/1/0428/5192/6183/files/soxagalulemikob.pdf
    • https://cdn.shopify.com/s/files/1/0428/6621/3031/files/job_interview_questions_and_answers_esl.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_off00004cfc.bin
2df49a734dc6949b014bfb23705fe5d85ca5c4efc0d2085bfb56f7f8cbdd29ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CFC 5640 bytes
font_01_sfnt_off0000601b.bin
ada2af13c028afa43b1647db6a33606072b74b7bd47f8246573accddcf0caafb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x601B 9796 bytes

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