Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d6c84f3832bb962…

MALICIOUS

PDF

41.9 KB Created: 2020-08-08 23:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 924d378d6480b2dc265d9ee3146a14ed SHA-1: 653f37a238f3d1c55d6bc0b74a6f347603855b5c SHA-256: 6d6c84f3832bb962f07666adeac6099ce266a72239242189f2a254a19d8dd610
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, which points to 'ttraff.cc'. This URL is presented within the document body, disguised as a link to 'blends and digraphs worksheets pdf'. The PDF also hosts a large number of external links, many pointing to Shopify domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicates maliciousness.

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=blends+and+digraphs+worksheets+pdf
    • http://files.educatedlittlemonsters.org/uploads/1/3/0/9/130969576/9149473.pdf
    • http://files.danechristopher.com/uploads/1/3/1/8/131856374/6eda2.pdf
    • http://files.mitchb.net/uploads/1/3/1/4/131408170/nobelimezarasozaripi.pdf
    • http://pojuxevuj.caradocpricefuneraldirectors.com/uploads/1/3/2/6/132695818/paxesodetozubasopul.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/9583/5295/files/1704580325.pdf
    • https://cdn.shopify.com/s/files/1/0430/8644/6746/files/wirebodosunokigufapap.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xanixiki.pdf
    • https://cdn.shopify.com/s/files/1/0427/8714/3839/files/paddy_chayefsky_network_screenplay.pdf
    • https://cdn.shopify.com/s/files/1/0427/9658/1020/files/classroom_action_research_report.pdf
    • https://cdn.shopify.com/s/files/1/0430/9850/5377/files/furolaxunerefawufudaf.pdf
    • https://cdn.shopify.com/s/files/1/0427/8580/0358/files/guwewajapute.pdf
    • https://cdn.shopify.com/s/files/1/0428/7699/3695/files/phase_2_phonics_activities.pdf
    • https://cdn.shopify.com/s/files/1/0438/3080/4637/files/character_design_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/93634460428.pdf
    • https://cdn.shopify.com/s/files/1/0434/7199/5033/files/39905562093.pdf
    • https://cdn.shopify.com/s/files/1/0428/1024/5286/files/bamuziwenulu.pdf
    • https://cdn.shopify.com/s/files/1/0435/2534/1343/files/mathematical_physics_books_for_bsc.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005818.bin
e65028297e97daaccec919e749abe3ec5bd8c97445d9823d5477c0e760ce377b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5818 5296 bytes
font_01_sfnt_off00006a22.bin
0d76f524c4f1f7577cbca197d86ab39568f74c29ffaee02c7378cd7c47be86b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A22 10044 bytes
font_02_sfnt_off00008c80.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C80 4324 bytes

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