Malicious PDF — malware analysis report

Static analysis result for SHA-256 648a4b67c47564a4…

MALICIOUS

PDF

38.1 KB Created: 2020-08-10 21:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41e3dfc2d96306dd647e48010e52ecd6 SHA-1: e6479adad527c9a66c581f7577a9c4e6a961d4e2 SHA-256: 648a4b67c47564a43b122bda0ac2513756d4cf21f76431aab519636d61132f4f
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and embedded links suggest a lure to download a file, likely a malicious payload. The ML classifier also strongly indicated 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=cambridge+certificate+in+advanced+english+1+pdf+download
    • http://files.daretodiyoc.com/uploads/1/3/0/7/130775518/6e8a7d270cff42.pdf
    • http://simap.pleasantpondgoldens.com/uploads/1/3/1/4/131483371/wudaz.pdf
    • http://rojexi.amaranthineartist.com/uploads/1/3/1/3/131382406/miboxenovopeza.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/9635/8565/files/ti_84_binomial_cdf_vs.pdf
    • https://cdn.shopify.com/s/files/1/0434/1468/3813/files/rariromutukutobaz.pdf
    • https://cdn.shopify.com/s/files/1/0437/3417/1797/files/6021850821.pdf
    • https://cdn.shopify.com/s/files/1/0439/2511/0952/files/cbse_syllabus_for_class_12_physics.pdf
    • https://cdn.shopify.com/s/files/1/0431/9179/5873/files/cg_police_question_paper_2020.pdf
    • http://files.pec.us.com/uploads/1/3/0/7/130775458/wuvasovomedidux-kemip-bivenebosa-ripilobadokomo.pdf
    • https://cdn.shopify.com/s/files/1/0430/4273/4229/files/eu_annexure_15.pdf
    • https://cdn.shopify.com/s/files/1/0429/4085/8527/files/38178377781.pdf
    • https://cdn.shopify.com/s/files/1/0428/1905/9868/files/biography_of_mahatma_gandhi_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/lotemikaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/4421/6730/files/84321959386.pdf
    • https://cdn.shopify.com/s/files/1/0427/4742/9031/files/comptia_linux_lpic-_1_cert_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/51879467456.pdf
    • https://cdn.shopify.com/s/files/1/0433/3741/6869/files/59701025021.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_off00004749.bin
31fdaac900a455f71685177e44fd7831a69593dc07b27e422971dcbf55b23579		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4749 5724 bytes
font_01_sfnt_off00005aad.bin
59c9ebe9c9b3015d61b08b53fbebe2a74f7a882b2c7225dabd29d1cd99622dbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AAD 10396 bytes
font_02_sfnt_off00007cdf.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CDF 4324 bytes

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