Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9b6a2cd50860685…

MALICIOUS

PDF

47.5 KB Created: 2020-08-07 06:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb2f558207b21397acadf5980087b0f7 SHA-1: c13ea347ae0d0aa6c5d092531ca6ed15bae7120f SHA-256: e9b6a2cd50860685756af507ede5b469ac15300be45b366f236234174749a8b4
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body and PDF structure reveal a large number of embedded URLs, many pointing to external PDF files, suggesting a link farm or SEO manipulation tactic. One of the primary URLs, 'https://ttraff.com/pify?keyword=calvarial+bone+graft+harvest+technique+pdf', is identified as a malicious redirector.

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=calvarial+bone+graft+harvest+technique+pdf
    • http://files.flymusic.studio/uploads/1/3/0/7/130775557/c123da934a3.pdf
    • http://momozip.incredimailhelpdesk.com/uploads/1/3/2/3/132303382/zivevamix.pdf
    • http://files.spectrian.net/uploads/1/3/2/7/132712358/xogozunifovaremidora.pdf
    • http://files.blmslibrary.org/uploads/1/3/1/6/131606644/ebdfe5.pdf
    • http://files.rebelgypsyartist.com/uploads/1/3/1/4/131455337/b4171c1effe41b4.pdf
    • https://cdn.shopify.com/s/files/1/0432/7551/8107/files/besipenorawikipax.pdf
    • https://cdn.shopify.com/s/files/1/0434/8936/2082/files/create_on_android.pdf
    • https://cdn.shopify.com/s/files/1/0434/8434/8569/files/libadokebejatamujapitu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0848/2724/files/barron_essential_words_for_the_ielts_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/8738/9087/files/65028950176.pdf
    • https://cdn.shopify.com/s/files/1/0434/8523/3318/files/types_of_antiretroviral_drugs.pdf
    • https://cdn.shopify.com/s/files/1/0435/2419/4468/files/sabiv.pdf
    • https://cdn.shopify.com/s/files/1/0430/0773/8019/files/cute_for_mac.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/xikotun.pdf
    • https://cdn.shopify.com/s/files/1/0430/7802/5377/files/posamukis.pdf
    • https://cdn.shopify.com/s/files/1/0440/6090/1528/files/todubitipusuv.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_off00006c25.bin
d3df90d02f2f6820f4c9b5075778876bae67be6718ef0c8374823c6064f95042		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C25 5648 bytes
font_01_sfnt_off00007f4b.bin
bcb1c7fe9fe8e76f836f520d9c2097ff1afa6bf08ec8fd5f366bc61411b2dbfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F4B 10460 bytes
font_02_sfnt_off0000a2fb.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2FB 4324 bytes

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