Malicious PDF — malware analysis report

Static analysis result for SHA-256 70772d006cf72996…

MALICIOUS

PDF

41.5 KB Created: 2020-08-02 20:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd55dd5380ec14d6238d8cc1efe310ef SHA-1: f25daacfdb0d95e9654cce6be28aa54cda42cdc5 SHA-256: 70772d006cf7299686f746ae9c89f97a68cb3615c4c5d287ba8e127d73698042
162 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a known malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the presence of a "download button" heuristic further supports a malicious intent. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics, indicating a likely attempt to redirect users to malicious content.

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.com/pify?keyword=github+windows+command+line
    • http://files.rivermenrodandgunclub.com/uploads/1/3/2/3/132302973/nomegariwutok-wibiwu-visinatixubuj-sojimuta.pdf
    • http://files.littlecakepot.com/uploads/1/3/2/6/132695633/tivesipizizor_zobajexexes.pdf
    • http://files.rhinedesign.org/uploads/1/3/2/7/132712558/7873972.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1045/6730/files/pump_action._22.pdf
    • https://cdn.shopify.com/s/files/1/0432/4504/3880/files/pawaporitegurezewuzomojux.pdf
    • https://cdn.shopify.com/s/files/1/0433/1254/5950/files/seduverovavawurexemarefos.pdf
    • https://cdn.shopify.com/s/files/1/0436/9353/9478/files/jutososuxejawiv.pdf
    • https://cdn.shopify.com/s/files/1/0440/7610/5893/files/fafuf.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4977/files/pepadebilexabusotorivuf.pdf
    • https://cdn.shopify.com/s/files/1/0429/8987/9445/files/95723263798.pdf
    • https://cdn.shopify.com/s/files/1/0432/5706/9721/files/lumad.pdf
    • https://cdn.shopify.com/s/files/1/0429/7215/1959/files/gukagidefigoda.pdf
    • https://cdn.shopify.com/s/files/1/0433/9505/5777/files/15638807074.pdf
    • https://cdn.shopify.com/s/files/1/0428/7676/4327/files/83591481425.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_off000062b8.bin
38776dad64065925f25e58e38695cbcb8efca226e02c61d99c92429292c8607e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62B8 5344 bytes
font_01_sfnt_off000074d3.bin
b9162cbd3a80d4dd75bf60ffae9459728004f3417fc969ec2a87ac2a44f80414		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74D3 10600 bytes

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