Malicious PDF — malware analysis report

Static analysis result for SHA-256 035b74fc6ede82c9…

MALICIOUS

PDF

47.3 KB Created: 2020-08-12 05:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af94acb5915ce023e746f80db1f8917e SHA-1: 7ca82fae3257e03173c5715a28658d9fdfdc5d82 SHA-256: 035b74fc6ede82c9acab315097c67ea5e1da007e3b3b618b45900dd2bfd44a22
162 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific malicious redirector URL, disguised as a technical document. The ML classifier strongly indicates maliciousness. The presence of numerous external links, including one to a known malicious redirector, suggests an attempt to lead the user to a compromised or malicious site, likely for further exploitation or phishing.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=ansible+interview+questions+and+answers+for+experienced+pdf
    • http://files.silvercloudvape.co.uk/uploads/1/3/1/3/131379894/5970433.pdf
    • http://files.asips.net/uploads/1/3/2/6/132681690/7133402.pdf
    • http://files.bordasmusic.com/uploads/1/3/2/6/132683330/zowokenosiw.pdf
    • http://segux.northwestcampingresources.com/uploads/1/3/0/9/130969742/2576737.pdf
    • http://files.madisontnt.com/uploads/1/3/1/8/131857782/porovig.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/7027/3174/files/weniranolomugifipovojalev.pdf
    • https://cdn.shopify.com/s/files/1/0432/3511/5175/files/kabasegobozefaduk.pdf
    • https://cdn.shopify.com/s/files/1/0437/6395/7909/files/catholic_catechism_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/4774/6716/files/96543157692.pdf
    • https://cdn.shopify.com/s/files/1/0438/4171/6389/files/72145268267.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9534/files/tedovafejerezarus.pdf
    • https://cdn.shopify.com/s/files/1/0429/7401/9740/files/58204334327.pdf
    • https://cdn.shopify.com/s/files/1/0435/9487/5039/files/79411511635.pdf
    • https://cdn.shopify.com/s/files/1/0432/8800/2710/files/croft_syntactic_categories_and_grammatical_relations.pdf
    • https://cdn.shopify.com/s/files/1/0434/3300/1126/files/litafiruvi.pdf
    • https://cdn.shopify.com/s/files/1/0434/4188/1254/files/bemebegu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7514/1783/files/zegizuzidoxe.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000781c.bin
2fc68ddbf04f65d9e9ab7167d9e40d890c77c488db3b67603098eff9c0a21d8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x781C 5624 bytes
font_01_sfnt_off00008b4c.bin
a2d09bd178c07b58600ab7b570308c9fc4afec6e43e3e20fc9e1bbf6169aa80e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B4C 10816 bytes

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