Malicious PDF — malware analysis report

Static analysis result for SHA-256 39cd460f081b056e…

MALICIOUS

PDF

48.7 KB Created: 2020-08-25 11:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d14b9a94f46ce4aa484f8cb6b22d9123 SHA-1: 5182bcac5a2cbde6c72210d7f99c704e0127ddc4 SHA-256: 39cd460f081b056e0c4142ca79493324ff52ca7d78bd8e7663caff7bccd422b0
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The embedded URL is part of a link farm, suggesting an attempt to manipulate search engine results or distribute malicious 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.ru/pify?keyword=mathematics+textbook+for+class+7+pdf
    • http://files.plumbingandgasheatinguk.co.uk/uploads/1/3/0/9/130969032/filudufetanorot.pdf
    • http://wetazipiz.carlsoncattlecompany.com/uploads/1/3/0/8/130813509/mepoluvuvadoro.pdf
    • http://files.mcmillinautomation.com/uploads/1/3/2/7/132710780/3614628.pdf
    • http://files.mcmillinautomation.com/uploads/
    • https://cdn.shopify.com/s/files/1/0450/2549/3150/files/clinical_pharmacokinetics_of_aminoglycosides.pdf
    • https://cdn.shopify.com/s/files/1/0454/3823/8878/files/pisogilawurij.pdf
    • https://cdn.shopify.com/s/files/1/0428/8951/1068/files/sample_ovpn_file.pdf
    • https://cdn.shopify.com/s/files/1/0435/7272/3875/files/70106083794.pdf
    • https://cdn.shopify.com/s/files/1/0429/3361/6803/files/wumosutenazufixif.pdf
    • https://cdn.shopify.com/s/files/1/0432/4386/4228/files/69464187999.pdf
    • https://cdn.shopify.com/s/files/1/0431/1393/9110/files/40019723682.pdf
    • https://cdn.shopify.com/s/files/1/0431/8186/7176/files/sipotonoxixegaditijev.pdf
    • https://cdn.shopify.com/s/files/1/0431/9503/9905/files/zosekiduniwoninisolafu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6318/9405/files/ap_stylebook_2015.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_off00007e63.bin
1716753be08cac3643aecff1cc2a4d9ba176cdce6efd9090483af9e7abfdfd55
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E63 5752 bytes
font_01_sfnt_off000091d6.bin
dcfa9770d65c4ef61d7259085f1aac5f24aee0642655664c289bd979cfe72cdb
pdf-font-stream PDF embedded font (sfnt) at offset 0x91D6 10532 bytes