Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cb113905b285dcc…

MALICIOUS

PDF

44.6 KB Created: 2020-08-16 20:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfb2189e3b97eec76e9e3ea007e0dfba SHA-1: 76591809139d32a5cb7203d59f0615c3834668b6 SHA-256: 9cb113905b285dcc9e45ce4c0f463b4665164994b530c08096eb17f47bbdc5e8
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link farm and a malicious redirector, indicating an attempt to drive traffic to potentially harmful sites. The document body, though obfuscated, contains text related to 'common core 5th grade math worksheets free' and a URL that appears to be a redirector, suggesting a lure to download or access malicious content. The ML classifier strongly flagged this PDF as malicious.

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/pify?keyword=common+core+5th+grade+math+worksheets+free
    • http://files.deeperlifehuntsville.org/uploads/1/3/2/6/132681207/ca6fd51117d70.pdf
    • http://files.creditriskanalytics.net/uploads/1/3/0/8/130874370/nuzozenol_nebiterefom.pdf
    • http://files.tuslawjba.com/uploads/1/3/1/8/131871814/6916851.pdf
    • http://mozafa.northernettessynchro.org/uploads/1/3/1/3/131383329/moragewexokonid.pdf
    • http://files.bethany-kalamazoo.org/uploads/1/3/1/3/131398334/dutuxojujoz-kosabojagefiwo-bobadebafixofe.pdf
    • https://cdn.shopify.com/s/files/1/0435/8530/6782/files/topics_in_nonlinear_functional_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0428/6971/9196/files/98461465222.pdf
    • https://cdn.shopify.com/s/files/1/0429/3938/3971/files/amazon_fire_5th_generation.pdf
    • https://cdn.shopify.com/s/files/1/0427/7973/8278/files/sewopewodolirutozefa.pdf
    • https://cdn.shopify.com/s/files/1/0439/6810/2558/files/kerorudes.pdf
    • https://cdn.shopify.com/s/files/1/0440/6899/5237/files/vlookup_excel_multiple_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0438/4414/1218/files/26786019576.pdf
    • https://cdn.shopify.com/s/files/1/0433/7428/0855/files/36525531178.pdf
    • https://cdn.shopify.com/s/files/1/0430/0118/4417/files/lobalewojirogenejavi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0678/6725/files/rock_characterization_testing_and_monitoring.pdf
    • https://cdn.shopify.com/s/files/1/0435/3140/3423/files/active_and_passive_voice_exercises_with_answers_advanced_level.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_off00006f48.bin
4f9134fa9056cccf754042d3fdff99dc1aa2f2d8b1fe134aaac6b0c7bc59dd5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F48 5588 bytes
font_01_sfnt_off00008233.bin
3173a734cac55d1e34d7e3f9cf744faf264a5cfd1f86e43bf52daad0ee7dd88d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8233 10212 bytes

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