Malicious PDF — malware analysis report

Static analysis result for SHA-256 83399f0c2cf7afaa…

MALICIOUS

PDF

45.0 KB Created: 2020-08-01 09:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d90e80bd25d21d3fb8637c28541fca0e SHA-1: ae22fa7442fe5d11ea94613b92a052433604df9d SHA-256: 83399f0c2cf7afaabd10d16e34dda07d94de35075931a20afa54bc1eeeb2d969
182 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The document body and heuristics indicate an impersonation of cloud document sharing services to trick users into clicking these links. The presence of a download button lure further supports a malicious intent to redirect users to potentially harmful content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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=how+to+upload+to+dropbox
    • http://files.oogeu.com/uploads/1/3/0/9/130969985/282451.pdf
    • http://files.brandtechnology.com/uploads/1/3/1/4/131408203/4740797.pdf
    • http://files.rolypolyproductions.com/uploads/1/3/0/9/130969377/e60e4686.pdf
    • http://files.carlsbaddesal.com/uploads/1/3/2/6/132681322/girilowamotozafofore.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/3600/0931/files/92793251961.pdf
    • https://cdn.shopify.com/s/files/1/0430/5167/9893/files/40135094990.pdf
    • https://cdn.shopify.com/s/files/1/0430/2857/8467/files/multivariable_calculus_stewart.pdf
    • https://cdn.shopify.com/s/files/1/0434/2788/9304/files/99422323277.pdf
    • https://cdn.shopify.com/s/files/1/0432/5454/6590/files/gimak.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/93434530871.pdf
    • https://cdn.shopify.com/s/files/1/0433/1615/0427/files/xoxizemofi.pdf
    • https://cdn.shopify.com/s/files/1/0437/5176/8225/files/revasurevumivofiwo.pdf
    • https://cdn.shopify.com/s/files/1/0435/6544/9365/files/bazalalevu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0204/4316/files/62441429528.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4024/files/tilakenoputafi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065a4.bin
cec8809d8dae2e83e75e90bcbd7e548b29afbec55b01f6c1efa1112b959b0426		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65A4 4648 bytes
font_01_sfnt_off00007586.bin
add99cdb8d084308992c0811e096353887538ea4a31d2b3fa92cb1260c427497		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7586 10404 bytes
font_02_sfnt_off00009919.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9919 4324 bytes

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