Malicious PDF — malware analysis report

Static analysis result for SHA-256 18c5c788d21cce81…

MALICIOUS

PDF

45.9 KB Created: 2020-08-22 17:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad62a0830bd1ea04c4b544ab4344bcf2 SHA-1: a1d26499c22a20bd38db0978aa026313881e25d3 SHA-256: 18c5c788d21cce81a89e2024a5e25e9ffa231a4c59584e6206d1d89ff830146d
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, many of which point to PDF files hosted on Shopify. One of the primary links, however, leads to a known malicious redirector. The document body also contains instructions that suggest copying and pasting content into a shell, indicating an attempt to execute commands, likely to download a second-stage payload. The ML classifier also strongly flagged this PDF as malicious.

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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.ru/pify?keyword=copy+google+sheet+to+another+sheet
    • http://files.victoria13gla.ca/uploads/1/3/0/7/130776060/rutedigasefo_ripekinal.pdf
    • http://jowal.artaxlaw.com/uploads/1/3/0/8/130874493/garukuvoxapuda.pdf
    • http://files.thecuriouscatgiftshop.com/uploads/1/3/2/6/132681596/puwakir.pdf
    • http://files.sparkfoundation.ca/uploads/1/3/2/8/132814371/970ad44f5df489.pdf
    • http://files.aiselementary.com/uploads/1/3/2/7/132740408/winaxipigogiwi-rudemul-welolafabin-jafuzifepifun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/1161/2572/files/defavifogelifozugewosefo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/nodekagizolekedamoketutar.pdf
    • https://cdn.shopify.com/s/files/1/0461/9675/2534/files/57228771461.pdf
    • https://cdn.shopify.com/s/files/1/0436/2184/3106/files/adding_fractions_worksheets_grade_4.pdf
    • https://cdn.shopify.com/s/files/1/0431/1570/8580/files/45985005068.pdf
    • https://cdn.shopify.com/s/files/1/0431/3006/0955/files/dusuzij.pdf
    • https://cdn.shopify.com/s/files/1/0433/8574/9654/files/13186010257.pdf
    • https://cdn.shopify.com/s/files/1/0428/8207/2732/files/xerefukovinifibut.pdf
    • https://cdn.shopify.com/s/files/1/0435/6866/0643/files/mizubexiwap.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_off000061cc.bin
121ac69480afa0a7a842aee86cf3ab91765e634011f4da9b29570b86c5e76b3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61CC 4944 bytes
font_01_sfnt_off0000729f.bin
91bd9c768a4925f0b88c24cbe10eb9b84ea2f13fa9fa2c699312a35ba55d0913		 pdf-font-stream PDF embedded font (sfnt) at offset 0x729F 13044 bytes
font_02_sfnt_off00009c84.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C84 4324 bytes

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