Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9fce90ff647a63f…

MALICIOUS

PDF

47.9 KB Created: 2020-08-21 20:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c673500634814c5f6849b1ed7d22daf7 SHA-1: 34e001b18a34fd5ffe61057e41ff1bce78a52c1b SHA-256: e9fce90ff647a63ffea62b5f73287f2725efcf68338fdce0a84c85678711898c
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. Additionally, it features a PDF link farm, suggesting an attempt to distribute or obscure malicious links. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the redirector URL, which is likely the initial step in a phishing or malware delivery chain.

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=html+form+post+content+type
    • http://files.nsna.org/uploads/1/3/2/6/132681901/b6657089a.pdf
    • https://cdn.shopify.com/s/files/1/0431/5453/8656/files/85103837876.pdf
    • https://cdn.shopify.com/s/files/1/0433/5645/5067/files/soxiraxijuma.pdf
    • https://cdn.shopify.com/s/files/1/0439/7613/0718/files/rulozikonofoxolovo.pdf
    • https://cdn.shopify.com/s/files/1/0434/2880/6808/files/71966937997.pdf
    • https://cdn.shopify.com/s/files/1/0432/9691/5616/files/vibepitoduseb.pdf
    • https://cdn.shopify.com/s/files/1/0434/1488/0405/files/bases_de_datos_relacionales.pdf
    • https://cdn.shopify.com/s/files/1/0430/9067/3813/files/xinusisalasutujejo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3505/7559/files/xetewopezidiki.pdf
    • https://cdn.shopify.com/s/files/1/0436/6453/9798/files/60014729550.pdf
    • https://cdn.shopify.com/s/files/1/0433/8660/1635/files/getatujejutuvukosa.pdf
    • https://cdn.shopify.com/s/files/1/0428/2174/6847/files/28902154442.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000681f.bin
5ac874e6cd8f4b30cc8dd7670675b19c495e5290f4fb7e6c486924a5b9154c52
pdf-font-stream PDF embedded font (sfnt) at offset 0x681F 3376 bytes
font_01_sfnt_off0000743f.bin
69866ff3fa2e74e65439ac6ac8bbbd8218f670609f5bf129daeb4c9ad55c4434
pdf-font-stream PDF embedded font (sfnt) at offset 0x743F 5016 bytes
font_02_sfnt_off00008543.bin
e83edeaed7e926787ba672f1a3bbe18b11621c1ad094065e337366c5ad9f7f25
pdf-font-stream PDF embedded font (sfnt) at offset 0x8543 14504 bytes