Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d8ebc4513509889…

MALICIOUS

PDF

39.6 KB Created: 2020-07-31 21:28:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0939b5420d4a12ed86e010cad4d0fab1 SHA-1: 584f8c9ef43817705b4e719fcc19bbb4d1c328bb SHA-256: 6d8ebc4513509889d1cf978bf9cc289276717efb6d25662cbf23660c8983eeeb
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, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The embedded link text suggests a lure for downloading a game, likely to trick users into clicking. The PDF also contains a large number of external links, characteristic of a link farm, which is often used to distribute malware or phish for credentials. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence score strongly suggest malicious intent.

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=halo+3+pc+download
    • http://files.dymondelise.com/uploads/1/3/0/7/130775025/785b4906f4072.pdf
    • http://files.lacnyc.org/uploads/1/3/2/6/132680813/pigodofavi.pdf
    • http://files.3rdspacecc.org/uploads/1/3/1/4/131452903/gewalupiwuxiza-zetevukozenu-surizotozedamu.pdf
    • http://files.linkuniforms.com/uploads/1/3/0/7/130738814/vozuxudezab_jamufipokojal.pdf
    • http://files.sinogermanexecutivesearch.com/uploads/1/3/1/3/131397927/2469569.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/7395/4204/files/pilategesenapizet.pdf
    • https://cdn.shopify.com/s/files/1/0429/6278/0311/files/55850000204.pdf
    • https://cdn.shopify.com/s/files/1/0431/9110/7742/files/32571859463.pdf
    • https://cdn.shopify.com/s/files/1/0431/8917/4432/files/89619958526.pdf
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/35399541051.pdf
    • https://cdn.shopify.com/s/files/1/0437/4842/5889/files/zasax.pdf
    • https://cdn.shopify.com/s/files/1/0434/8523/3302/files/busomedidovozegutudo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7559/9524/files/texamu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8178/5753/files/73086575213.pdf
    • https://cdn.shopify.com/s/files/1/0432/5516/9182/files/22462089563.pdf
    • https://cdn.shopify.com/s/files/1/0430/2897/1681/files/51185392423.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_off00005d82.bin
2d40d6c384b4c548d36c743947cc52ff9945ffd928c58beab6273ab0c9455d60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D82 5008 bytes
font_01_sfnt_off00006eb4.bin
f721ba31488c35283b8ffe917dce4bdec67b58463100de4ad034125481e19b0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EB4 10264 bytes

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