Malicious PDF — malware analysis report

Static analysis result for SHA-256 8850e0a3078e0982…

MALICIOUS

PDF

42.0 KB Created: 2020-09-17 03:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00dcbad3b54ee060374743242bd054e3 SHA-1: 02377a2019f958d290470065fd1bc8a9a1f24478 SHA-256: 8850e0a3078e09829139199998c5dc42053199d0093231f32600b325a1076dc8
184 Risk Score

Malware Insights

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

This PDF file contains a large number of links to external PDF documents, a common tactic for SEO spam or distributing malicious content. One of the embedded URLs, https://ttraff.cc/wb?keyword=odd%20and%20even%20numbers%20lesson%20plan%20pdf, is identified as a malicious redirector, likely leading to further malicious sites or payloads. The document itself appears to be generated by wkhtmltopdf, suggesting it was programmatically created.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wb?keyword=odd%20and%20even%20numbers%20lesson%20plan%20pdf
    • http://files.ryansteiny.com/uploads/1/3/0/7/130740033/8951584.pdf
    • http://xesiwu.dollargeneralpennylist.com/uploads/1/3/1/4/131406352/jejale_reputibub_narisikexafovin.pdf
    • http://files.monasfamilyemporium.com/uploads/1/3/0/8/130873895/2420688e779a2.pdf
    • http://jixedez.quiteabite.com/uploads/1/3/1/4/131482975/9e30f5de59a23.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2ea4e896-351e-49a5-8485-5460d02f451b.filesusr.com/ugd/8cbfce_19720f0e67704553a27d0ff4cf58c425.pdf?index=true
    • https://a6d62d66-d616-4ee9-851d-5b4123f9c2f8.filesusr.com/ugd/e2c223_8268a68ae0304c8bb4cc7b4c7ef7c429.pdf?index=true
    • https://5349fab8-7f4a-4ce5-9eb0-5238c2951b17.filesusr.com/ugd/e2c6c1_aa804c0ca4ed45ee9d07b7b201d08a30.pdf?index=true
    • https://c19ba6c4-1c04-44bc-a5b5-0cd1f7c1c6e6.filesusr.com/ugd/003b86_b15f15f057cb43f4872d91106c26ee3d.pdf?index=true
    • https://57a35d38-ee79-4337-bf67-8e48a00e1a41.filesusr.com/ugd/24deb6_20fb2ba7b8f146d0be0bdd59c9a7fddd.pdf?index=true
    • https://70387b73-52bd-4135-8537-d80b558ad1b7.filesusr.com/ugd/d4a9d6_03f08a93811a41d4a39aac3e7c9b1919.pdf?index=true
    • https://38c53b61-4fb2-4fce-8fd1-63f0a1a70e2c.filesusr.com/ugd/0a51c1_0eadf86d9d8c429a8dacd425253f6023.pdf?index=true
    • https://0c06f511-ebf2-4c52-b759-4d10d3247305.filesusr.com/ugd/451a43_b6e872bcbdb6497892859285fd189ebd.pdf?index=true
    • https://d98eb94b-768e-435b-b4dc-31d5b70787be.filesusr.com/ugd/02beb7_1286a89cfdaa4d9e8c95bcbd08671eb4.pdf?index=true
    • https://ef8e4aca-7ecf-40c6-b081-74b10da94a5f.filesusr.com/ugd/8e1900_da1c4e8cac26405cab41b9fdc44fa911.pdf?index=true
    • 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_off00006578.bin
fb26aad103aa0d3700015323b61106ae1d6ce4fd3d6f7601a32edfafc70670e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6578 5416 bytes
font_01_sfnt_off000077c3.bin
f73f4f96ed1060df3a607aa8a860c124c7f774de7600a8fd87a0d5257081a5e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77C3 10392 bytes

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