Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a0400b105f8884e…

MALICIOUS

PDF

45.0 KB Created: 2020-08-05 09:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee9f5c88c9e408314741779bf9413603 SHA-1: c79f16e0034daa66e52906ff9740894c8401e00b SHA-256: 6a0400b105f8884ebc7a864a2ee2625c61ae1f7d98b0ae5251ce331f6d561256
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to appear as educational resources, but the primary link redirects to malicious infrastructure. The ML classifier strongly indicates maliciousness, and the PDF is configured to redirect users to potentially harmful content.

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.cc/pify?keyword=botany+notes+class+11+pdf
    • http://files.happy-bandits.com/uploads/1/3/1/4/131454355/nebaxasuvubo_taligituva_vobasaberigar_nivave.pdf
    • http://fokiluni.jerseygod.com/uploads/1/3/1/4/131408280/kakerobewezosamu.pdf
    • http://files.jamjarflowers.co.nz/uploads/1/3/2/7/132712407/584db789344.pdf
    • http://files.ksweducationalconcepts.com/uploads/1/3/0/7/130776220/bivasu-fekowunodibu-sukarema-narogoxegew.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9755/5108/files/waviwegitajudab.pdf
    • https://cdn.shopify.com/s/files/1/0428/5769/3347/files/wetifekonutulokidoxu.pdf
    • https://cdn.shopify.com/s/files/1/0436/4563/2665/files/49765231361.pdf
    • https://cdn.shopify.com/s/files/1/0431/3215/8116/files/julelajewapesekazujowi.pdf
    • https://cdn.shopify.com/s/files/1/0447/0777/4618/files/six_pack_shortcut_workout.pdf
    • https://cdn.shopify.com/s/files/1/0437/2883/0625/files/41886018327.pdf
    • https://cdn.shopify.com/s/files/1/0428/2351/6323/files/50954132650.pdf
    • https://cdn.shopify.com/s/files/1/0428/4992/7327/files/53943858092.pdf
    • https://cdn.shopify.com/s/files/1/0434/1065/3338/files/zaxeke.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/punafaga.pdf
    • https://cdn.shopify.com/s/files/1/0432/0644/3176/files/rirodoludaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/jikudavaka.pdf
    • https://cdn.shopify.com/s/files/1/0430/4912/3993/files/how_to_add_in_python.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/89659803755.pdf
    • https://cdn.shopify.com/s/files/1/0431/4877/1488/files/mva_bill_of_sale.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_off00007172.bin
3f805d08207938e01fc9b581c3d2fc4cb17e894b0f683b100ea550a6dbfb10f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7172 5256 bytes
font_01_sfnt_off0000837d.bin
676580d75cd569c9de80f687309da5c48b4ed2ae496344fc800d532461afebb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x837D 10332 bytes

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