Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e83c7311a22de4d…

MALICIOUS

PDF

35.8 KB Created: 2020-08-09 05:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08d78827729b0baab56754e56d99346a SHA-1: 7fee8df7bb55ba5c3d316b67c6a29d9b8a3f0a1c SHA-256: 0e83c7311a22de4d7053fdb8c261ad3ffbf461b6cc55f2dc517c87db6320f071
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of embedded links, many of which point to a redirector service designed to obscure the final destination. The primary malicious URL identified is https://ttraff.com/pify?keyword=hodder+cambridge+primary+maths+stage+4+pdf, which is likely used to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests a link farm or redirection tactic.

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=hodder+cambridge+primary+maths+stage+4+pdf
    • http://files.centralhealthcare.org/uploads/1/3/1/0/131070506/9325927.pdf
    • http://files.peakhealthcaremaryland.com/uploads/1/3/1/4/131406816/rizapisopasiraluzoga.pdf
    • http://files.bloomkc.org/uploads/1/3/1/4/131453645/vazavisovufuma.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/7898/4614/files/xinotanodubapo.pdf
    • https://cdn.shopify.com/s/files/1/0437/7490/2423/files/nikudekijamuretuxuwafitar.pdf
    • https://cdn.shopify.com/s/files/1/0431/0581/2629/files/81041451684.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/37629755229.pdf
    • https://cdn.shopify.com/s/files/1/0433/9544/8997/files/5516407568.pdf
    • https://cdn.shopify.com/s/files/1/0431/8976/4245/files/livestock_farming_in_zambia.pdf
    • https://cdn.shopify.com/s/files/1/0434/5217/0406/files/84649781434.pdf
    • https://cdn.shopify.com/s/files/1/0433/9089/4247/files/ngo_full_form.pdf
    • https://cdn.shopify.com/s/files/1/0434/0924/4316/files/zotavunitul.pdf
    • https://cdn.shopify.com/s/files/1/0434/8290/6789/files/wizulososewubetixo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7962/2040/files/dasuweburofoxonuxinapaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/5190/0310/files/27142885812.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8317/files/technical_report_on_building_construction.pdf
    • https://cdn.shopify.com/s/files/1/0437/4410/0506/files/xereterir.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_off00004c65.bin
3be009a84f9cc42b203f00e0a796b0f0385e895bca5ab17a4f8f07cb4fedbc40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C65 5828 bytes
font_01_sfnt_off0000601f.bin
a245e51dd0000d4179cd1014cfb5bfdeb9cbf949402fd74a0de325d46afb8fe4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x601F 10048 bytes

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